相親數 (amicable number / amicable pairs)
相親數稱又親和數或友愛數。
若某兩個正整數其彼此的所有真因數和與另一個相等,則稱這兩個數為相親數。
用數學表示:
函數 σ(n) 為正整數 n 的所有因數和
若有兩正整數 m, n (m
其 σ(m) - m = n
且 σ(n) - n = m
故 σ(m) = σ(n) = m + n
則 m, n 稱為相親數
相親數有無限多個,表列前400個如下︰
1 | 220 | 284 | 101 | 9199496 | 9592504 |
2 | 1184 | 1210 | 102 | 9206925 | 10791795 |
3 | 2620 | 2924 | 103 | 9339704 | 9892936 |
4 | 5020 | 5564 | 104 | 9363584 | 9437056 |
5 | 6232 | 6368 | 105 | 9478910 | 11049730 |
6 | 10744 | 10856 | 106 | 9491625 | 10950615 |
7 | 12285 | 14595 | 107 | 9660950 | 10025290 |
8 | 17296 | 18416 | 108 | 9773505 | 11791935 |
9 | 63020 | 76084 | 109 | 10254970 | 10273670 |
10 | 66928 | 66992 | 110 | 10533296 | 10949704 |
11 | 67095 | 71145 | 111 | 10572550 | 10854650 |
12 | 69615 | 87633 | 112 | 10596368 | 11199112 |
13 | 79750 | 88730 | 113 | 10634085 | 14084763 |
14 | 100485 | 124155 | 114 | 10992735 | 12070305 |
15 | 122265 | 139815 | 115 | 11173460 | 13212076 |
16 | 122368 | 123152 | 116 | 11252648 | 12101272 |
17 | 141664 | 153176 | 117 | 11498355 | 12024045 |
18 | 142310 | 168730 | 118 | 11545616 | 12247504 |
19 | 171856 | 176336 | 119 | 11693290 | 12361622 |
20 | 176272 | 180848 | 120 | 11905504 | 13337336 |
21 | 185368 | 203432 | 121 | 12397552 | 13136528 |
22 | 196724 | 202444 | 122 | 12707704 | 14236136 |
23 | 280540 | 365084 | 123 | 13671735 | 15877065 |
24 | 308620 | 389924 | 124 | 13813150 | 14310050 |
25 | 319550 | 430402 | 125 | 13921528 | 13985672 |
26 | 356408 | 399592 | 126 | 14311688 | 14718712 |
27 | 437456 | 455344 | 127 | 14426230 | 18087818 |
28 | 469028 | 486178 | 128 | 14443730 | 15882670 |
29 | 503056 | 514736 | 129 | 14654150 | 16817050 |
30 | 522405 | 525915 | 130 | 15002464 | 15334304 |
31 | 600392 | 669688 | 131 | 15363832 | 16517768 |
32 | 609928 | 686072 | 132 | 15938055 | 17308665 |
33 | 624184 | 691256 | 133 | 16137628 | 16150628 |
34 | 635624 | 712216 | 134 | 16871582 | 19325698 |
35 | 643336 | 652664 | 135 | 17041010 | 19150222 |
36 | 667964 | 783556 | 136 | 17257695 | 17578785 |
37 | 726104 | 796696 | 137 | 17754165 | 19985355 |
38 | 802725 | 863835 | 138 | 17844255 | 19895265 |
39 | 879712 | 901424 | 139 | 17908064 | 18017056 |
40 | 898216 | 980984 | 140 | 18056312 | 18166888 |
41 | 947835 | 1125765 | 141 | 18194715 | 22240485 |
42 | 998104 | 1043096 | 142 | 18655744 | 19154336 |
43 | 1077890 | 1099390 | 143 | 20014808 | 21457192 |
44 | 1154450 | 1189150 | 144 | 20022328 | 22823432 |
45 | 1156870 | 1292570 | 145 | 20308995 | 20955645 |
46 | 1175265 | 1438983 | 146 | 21448630 | 23030090 |
47 | 1185376 | 1286744 | 147 | 22227075 | 24644925 |
48 | 1280565 | 1340235 | 148 | 22249552 | 25325528 |
49 | 1328470 | 1483850 | 149 | 22508145 | 23111055 |
50 | 1358595 | 1486845 | 150 | 22608632 | 25775368 |
51 | 1392368 | 1464592 | 151 | 23358248 | 25233112 |
52 | 1466150 | 1747930 | 152 | 23389695 | 25132545 |
53 | 1468324 | 1749212 | 153 | 23628940 | 27428276 |
54 | 1511930 | 1598470 | 154 | 24472180 | 30395276 |
55 | 1669910 | 2062570 | 155 | 25596544 | 25640096 |
56 | 1798875 | 1870245 | 156 | 25966832 | 26529808 |
57 | 2082464 | 2090656 | 157 | 26090325 | 26138475 |
58 | 2236570 | 2429030 | 158 | 28118032 | 28128368 |
59 | 2652728 | 2941672 | 159 | 28608424 | 29603576 |
60 | 2723792 | 2874064 | 160 | 30724694 | 32174506 |
61 | 2728726 | 3077354 | 161 | 30830696 | 31652704 |
62 | 2739704 | 2928136 | 162 | 31536855 | 32148585 |
63 | 2802416 | 2947216 | 163 | 31818952 | 34860248 |
64 | 2803580 | 3716164 | 164 | 32205616 | 34352624 |
65 | 3276856 | 3721544 | 165 | 32642324 | 35095276 |
66 | 3606850 | 3892670 | 166 | 32685250 | 34538270 |
67 | 3786904 | 4300136 | 167 | 33501825 | 36136575 |
68 | 3805264 | 4006736 | 168 | 34256222 | 35997346 |
69 | 4238984 | 4314616 | 169 | 34364912 | 34380688 |
70 | 4246130 | 4488910 | 170 | 34765731 | 36939357 |
71 | 4259750 | 4445050 | 171 | 35115795 | 43266285 |
72 | 4482765 | 5120595 | 172 | 35361326 | 40117714 |
73 | 4532710 | 6135962 | 173 | 35373195 | 40105845 |
74 | 4604776 | 5162744 | 174 | 35390008 | 39259592 |
75 | 5123090 | 5504110 | 175 | 35472592 | 36415664 |
76 | 5147032 | 5843048 | 176 | 37363095 | 45663849 |
77 | 5232010 | 5799542 | 177 | 37784810 | 39944086 |
78 | 5357625 | 5684679 | 178 | 37848915 | 39202605 |
79 | 5385310 | 5812130 | 179 | 38400512 | 38938288 |
80 | 5459176 | 5495264 | 180 | 38637016 | 40678184 |
81 | 5726072 | 6369928 | 181 | 38663950 | 43362050 |
82 | 5730615 | 6088905 | 182 | 38783992 | 41654408 |
83 | 5864660 | 7489324 | 183 | 38807968 | 40912232 |
84 | 6329416 | 6371384 | 184 | 43096904 | 46715896 |
85 | 6377175 | 6680025 | 185 | 44139856 | 44916944 |
86 | 6955216 | 7418864 | 186 | 45263384 | 46137016 |
87 | 6993610 | 7158710 | 187 | 46237730 | 61319902 |
88 | 7275532 | 7471508 | 188 | 46271745 | 49125375 |
89 | 7288930 | 8221598 | 189 | 46521405 | 53011395 |
90 | 7489112 | 7674088 | 190 | 46555250 | 55880590 |
91 | 7577350 | 8493050 | 191 | 46991890 | 48471470 |
92 | 7677248 | 7684672 | 192 | 48639032 | 52967368 |
93 | 7800544 | 7916696 | 193 | 48641584 | 48852176 |
94 | 7850512 | 8052488 | 194 | 49215166 | 55349570 |
95 | 8262136 | 8369864 | 195 | 50997596 | 51737764 |
96 | 8619765 | 9627915 | 196 | 52695376 | 56208368 |
97 | 8666860 | 10638356 | 197 | 56055872 | 56598208 |
98 | 8754130 | 10893230 | 198 | 56512610 | 75866014 |
99 | 8826070 | 10043690 | 199 | 56924192 | 64562488 |
100 | 9071685 | 9498555 | 200 | 58580540 | 70507972 |
201 | 59497888 | 61953512 | 301 | 190888155 | 194594085 |
202 | 63560025 | 65003175 | 302 | 195857415 | 196214265 |
203 | 63717615 | 66011985 | 303 | 196421715 | 224703405 |
204 | 66595130 | 74824390 | 304 | 199432948 | 213484172 |
205 | 66854710 | 71946890 | 305 | 200328232 | 206790368 |
206 | 67729064 | 69439576 | 306 | 200879055 | 206393265 |
207 | 67738268 | 79732132 | 307 | 201168592 | 203314448 |
208 | 68891992 | 78437288 | 308 | 203055622 | 210627578 |
209 | 71015260 | 85458596 | 309 | 203972715 | 207429525 |
210 | 71241830 | 78057370 | 310 | 204134385 | 244869135 |
211 | 72958556 | 74733604 | 311 | 204756904 | 226163096 |
212 | 73032872 | 78469528 | 312 | 205843365 | 254264283 |
213 | 74055952 | 78166448 | 313 | 208693628 | 255308932 |
214 | 74386305 | 87354495 | 314 | 209027128 | 224355272 |
215 | 74769345 | 82824255 | 315 | 209309704 | 209816696 |
216 | 75171808 | 77237792 | 316 | 211319745 | 234587199 |
217 | 75226888 | 81265112 | 317 | 214748488 | 245201912 |
218 | 78088504 | 88110536 | 318 | 216392216 | 218772184 |
219 | 78447010 | 80960990 | 319 | 221397165 | 235831635 |
220 | 79324875 | 87133365 | 320 | 223878416 | 227342704 |
221 | 80422335 | 82977345 | 321 | 224888895 | 273272769 |
222 | 82633005 | 104177619 | 322 | 226540432 | 231465968 |
223 | 83135650 | 85603550 | 323 | 227443340 | 302651764 |
224 | 84521745 | 107908335 | 324 | 231111392 | 231923488 |
225 | 84591405 | 89590995 | 325 | 238162815 | 270560385 |
226 | 86158220 | 99188788 | 326 | 238238864 | 244730224 |
227 | 87998470 | 102358010 | 327 | 242126704 | 257841296 |
228 | 88144630 | 102814490 | 328 | 242182930 | 258410030 |
229 | 89477984 | 92143456 | 329 | 245618415 | 266560785 |
230 | 90437150 | 94372450 | 330 | 248658488 | 256201912 |
231 | 91996816 | 93259184 | 331 | 250876395 | 323303445 |
232 | 93837808 | 99899792 | 332 | 251302370 | 271244830 |
233 | 95629904 | 97580944 | 333 | 252551048 | 279327352 |
234 | 95791430 | 115187002 | 334 | 252940545 | 284847615 |
235 | 96304845 | 96747315 | 335 | 253703776 | 260678624 |
236 | 97041735 | 97945785 | 336 | 256755056 | 273568144 |
237 | 102023145 | 116970399 | 337 | 256948065 | 263110815 |
238 | 102719740 | 129063812 | 338 | 258904646 | 269448634 |
239 | 103034776 | 105016424 | 339 | 260231192 | 266171608 |
240 | 104887448 | 105064552 | 340 | 264764630 | 290441770 |
241 | 108734050 | 116251550 | 341 | 265192208 | 275148208 |
242 | 109410345 | 110132055 | 342 | 267217335 | 347397705 |
243 | 110960710 | 125222330 | 343 | 270039910 | 301444250 |
244 | 114944072 | 125269528 | 344 | 270208672 | 274655648 |
245 | 115259625 | 123757335 | 345 | 271048340 | 331636372 |
246 | 115447424 | 118458976 | 346 | 271629728 | 279947872 |
247 | 115749344 | 116983744 | 347 | 273141836 | 306014644 |
248 | 116654896 | 120115664 | 348 | 274638460 | 302514116 |
249 | 118458830 | 131819506 | 349 | 274893410 | 284512030 |
250 | 120812175 | 126671985 | 350 | 275304590 | 281534770 |
251 | 121293315 | 138690045 | 351 | 275631376 | 281207984 |
252 | 127924335 | 148532625 | 352 | 276339808 | 278431136 |
253 | 131118975 | 132926625 | 353 | 278247976 | 293288024 |
254 | 131483835 | 132692805 | 354 | 281499435 | 297034965 |
255 | 133089500 | 176374564 | 355 | 285627615 | 293528865 |
256 | 133178325 | 133471275 | 356 | 286000065 | 297390015 |
257 | 133768816 | 141213584 | 357 | 287250632 | 287551288 |
258 | 134312152 | 139057448 | 358 | 287793350 | 302793850 |
259 | 134886465 | 147382335 | 359 | 291679245 | 339731955 |
260 | 136549413 | 140207067 | 360 | 291974824 | 299001176 |
261 | 136770075 | 155711205 | 361 | 295824376 | 299072024 |
262 | 137424188 | 141993412 | 362 | 300120652 | 347620148 |
263 | 138605350 | 147313850 | 363 | 300208696 | 313576904 |
264 | 139009990 | 156322490 | 364 | 301685895 | 342005985 |
265 | 140744835 | 166562685 | 365 | 302424784 | 303107888 |
266 | 140815384 | 155709416 | 366 | 302770672 | 306676928 |
267 | 144788020 | 186088988 | 367 | 304443436 | 305517524 |
268 | 145040288 | 149364256 | 368 | 305178874 | 356714246 |
269 | 146648612 | 159017308 | 369 | 305363984 | 306962896 |
270 | 147366765 | 182028483 | 370 | 305911606 | 331160522 |
271 | 148077644 | 160128436 | 371 | 308939936 | 318479584 |
272 | 153015550 | 168392450 | 372 | 311414355 | 338659245 |
273 | 154190750 | 190889986 | 373 | 311913855 | 326754945 |
274 | 155578180 | 172610492 | 374 | 312090808 | 332345192 |
275 | 155797390 | 165195890 | 375 | 316293016 | 322375784 |
276 | 156226856 | 165181144 | 376 | 318323864 | 324492136 |
277 | 157151410 | 163634510 | 377 | 318580262 | 343312858 |
278 | 161088158 | 166706530 | 378 | 319682650 | 382593830 |
279 | 162936904 | 166679096 | 379 | 319904235 | 370086165 |
280 | 164733752 | 166212808 | 380 | 320829728 | 327818272 |
281 | 165323696 | 167155024 | 381 | 323401712 | 332270608 |
282 | 165742395 | 182622405 | 382 | 324644792 | 352731208 |
283 | 166737550 | 188953970 | 383 | 330811850 | 354858550 |
284 | 168930032 | 179904784 | 384 | 332448224 | 338290096 |
285 | 169000448 | 173499952 | 385 | 332573392 | 335955248 |
286 | 169335790 | 179029010 | 386 | 334438875 | 358687845 |
287 | 169652512 | 173269088 | 387 | 339981512 | 373803448 |
288 | 169884784 | 173843216 | 388 | 343175404 | 364682516 |
289 | 170566690 | 197704670 | 389 | 346657311 | 370393569 |
290 | 172271385 | 197261415 | 390 | 347263216 | 370414064 |
291 | 175032884 | 175826716 | 391 | 347401035 | 365917365 |
292 | 176632390 | 182618810 | 392 | 348782488 | 371171432 |
293 | 177997352 | 182108128 | 393 | 356775430 | 392753210 |
294 | 180038452 | 193486028 | 394 | 357197302 | 409205258 |
295 | 181088985 | 184694055 | 395 | 359156770 | 402020318 |
296 | 182702024 | 184713976 | 396 | 360027675 | 433850085 |
297 | 183408615 | 190055385 | 397 | 360172336 | 383753264 |
298 | 186753688 | 208059752 | 398 | 360759652 | 393667868 |
299 | 186878110 | 196323170 | 399 | 362645570 | 398531518 |
300 | 189406984 | 203592056 | 400 | 362700728 | 413408872 |
前39374項相親數之前項請參考OEIS的A002025
前39374項相親數之後項請參考OEIS的A002046
已知的相親數請參考 Jan Munch Pedersen 的 Known Amicable Pairs
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