阿姆斯壯數 (Armstrong number)、水仙花數或自戀數 (narcissistic number)
pluperfect digital invariant, plus perfect number
若某 k 位數的正整數,其所有位數數字的 k 次方和與該數相等,則該數稱為阿姆斯壯數。
用數學表示:
若
當 k 位數的 di (1 ≤ i ≤ k) 滿足 0 ≤ di ≤ 9
其
則 N 稱為阿姆斯壯數。
阿姆斯壯數共有88個,表列如下︰
|
|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 4 |
5 | 5 |
6 | 6 |
7 | 7 |
8 | 8 |
9 | 9 |
10 | 153 |
11 | 370 |
12 | 371 |
13 | 407 |
14 | 1634 |
15 | 8208 |
16 | 9474 |
17 | 54748 |
18 | 92727 |
19 | 93084 |
20 | 548834 |
21 | 1741725 |
22 | 4210818 |
23 | 9800817 |
24 | 9926315 |
25 | 24678050 |
26 | 24678051 |
27 | 88593477 |
28 | 146511208 |
29 | 472335975 |
30 | 534494836 |
31 | 912985153 |
32 | 4679307774 |
33 | 32164049650 |
34 | 32164049651 |
35 | 40028394225 |
36 | 42678290603 |
37 | 44708635679 |
38 | 49388550606 |
39 | 82693916578 |
40 | 94204591914 |
41 | 28116440335967 |
42 | 4338281769391370 |
43 | 4338281769391371 |
44 | 21897142587612075 |
45 | 35641594208964132 |
46 | 35875699062250035 |
47 | 1517841543307505039 |
48 | 3289582984443187032 |
49 | 4498128791164624869 |
50 | 4929273885928088826 |
51 | 63105425988599693916 |
52 | 128468643043731391252 |
53 | 449177399146038697307 |
54 | 21887696841122916288858 |
55 | 27879694893054074471405 |
56 | 27907865009977052567814 |
57 | 28361281321319229463398 |
58 | 35452590104031691935943 |
59 | 174088005938065293023722 |
60 | 188451485447897896036875 |
61 | 239313664430041569350093 |
62 | 1550475334214501539088894 |
63 | 1553242162893771850669378 |
64 | 3706907995955475988644380 |
65 | 3706907995955475988644381 |
66 | 4422095118095899619457938 |
67 | 121204998563613372405438066 |
68 | 121270696006801314328439376 |
69 | 128851796696487777842012787 |
70 | 174650464499531377631639254 |
71 | 177265453171792792366489765 |
72 | 14607640612971980372614873089 |
73 | 19008174136254279995012734740 |
74 | 19008174136254279995012734741 |
75 | 23866716435523975980390369295 |
76 | 1145037275765491025924292050346 |
77 | 1927890457142960697580636236639 |
78 | 2309092682616190307509695338915 |
79 | 17333509997782249308725103962772 |
80 | 186709961001538790100634132976990 |
81 | 186709961001538790100634132976991 |
82 | 1122763285329372541592822900204593 |
83 | 12639369517103790328947807201478392 |
84 | 12679937780272278566303885594196922 |
85 | 1219167219625434121569735803609966019 |
86 | 12815792078366059955099770545296129367 |
87 | 115132219018763992565095597973971522400 |
88 | 115132219018763992565095597973971522401 |
|
阿姆斯壯數請參考OEIS的A005188
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