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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.

A257660 Numbers n such that 13^phi(n) == 1 (mod n^2), where phi(n) = A000010(n).

Table of values

n a(n)
1 2
2 863
3 1726
4 3452
5 371953
6 743906
7 1487812
8 1747591
9 1859765
10 2975624
11 3495182
12 3719530
13 5242773
14 6990364
15 7439060
16 8737955
17 10485546
18 14878120
19 15993979
20 17475910
21 20971092
22 26213865
23 29756240
24 31987958
25 34951820
26 41942184
27 47981937
28 52427730
29 59512480

List of values

[2, 863, 1726, 3452, 371953, 743906, 1487812, 1747591, 1859765, 2975624, 3495182, 3719530, 5242773, 6990364, 7439060, 8737955, 10485546, 14878120, 15993979, 17475910, 20971092, 26213865, 29756240, 31987958, 34951820, 41942184, 47981937, 52427730, 59512480]

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

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