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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A171258 Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).

Table of values

n a(n)
1 630
2 5544
3 11160
4 18810
5 27000
6 57000
7 80388
8 161820
9 178020
10 182880
11 242820
12 265608
13 388620
14 391500
15 447678
16 465192
17 522522
18 671760
19 690120
20 711000
21 775170
22 826500
23 901170
24 1051830
25 1102290
26 1157130
27 1418160
28 1578330
29 1679400
30 1812384
31 1874520
32 1993824

List of values

[630, 5544, 11160, 18810, 27000, 57000, 80388, 161820, 178020, 182880, 242820, 265608, 388620, 391500, 447678, 465192, 522522, 671760, 690120, 711000, 775170, 826500, 901170, 1051830, 1102290, 1157130, 1418160, 1578330, 1679400, 1812384, 1874520, 1993824]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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