cp's OEIS Frontend

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.

A336486 The least prime s for which there exist primes p, q, r such that phi(p*q*s^n) = phi(r*s^(2n+1)) and sigma(p*q*s^n) = sigma(r*s^(2n+1)).

Table of values

n a(n)
1 2
2 2
3 2
4 2
5 5
6 37
7 13
8 7
9 2
10 19
11 7
12 7
13 2
14 19
15 4447
16 2
17 2
18 2
19 2
20 5
21 73
22 23
23 37
24 2
25 2
26 19
27 19
28 2
29 2

List of values

[2, 2, 2, 2, 5, 37, 13, 7, 2, 19, 7, 7, 2, 19, 4447, 2, 2, 2, 2, 5, 73, 23, 37, 2, 2, 19, 19, 2, 2]

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

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