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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.

A171256 Numbers n such that sigma(n) = 10*phi(n) (where sigma=A000203, phi=A000010).

Table of values

n a(n)
1 168
2 270
3 570
4 2376
5 2436
6 5016
7 6426
8 7110
9 13566
10 15834
11 34452
12 58520
13 62568
14 72732
15 75210
16 113832
17 126882
18 168756
19 169218
20 191862
21 199368
22 223938
23 240312
24 280488
25 308568
26 321468
27 420888
28 449442
29 472758
30 661848
31 673608
32 776736
33 848540
34 854496
35 907236

List of values

[168, 270, 570, 2376, 2436, 5016, 6426, 7110, 13566, 15834, 34452, 58520, 62568, 72732, 75210, 113832, 126882, 168756, 169218, 191862, 199368, 223938, 240312, 280488, 308568, 321468, 420888, 449442, 472758, 661848, 673608, 776736, 848540, 854496, 907236]

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

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