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.

A197952 Numbers n such that sigma(phi(n))/sigma(n) = 5.

Table of values

n a(n)
1 1033474069
2 1604277377
3 2741806637
4 9941342981
5 14754456491
6 14859359791
7 15887724883
8 16990353761
9 17266051069
10 20892536447
11 21776951239
12 24435763193
13 25165559143
14 32325726313
15 38313868379
16 38580669727
17 38856433193
18 47906215417
19 49094416289
20 56237053007

List of values

[1033474069, 1604277377, 2741806637, 9941342981, 14754456491, 14859359791, 15887724883, 16990353761, 17266051069, 20892536447, 21776951239, 24435763193, 25165559143, 32325726313, 38313868379, 38580669727, 38856433193, 47906215417, 49094416289, 56237053007]

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

Content is available under The OEIS End-User License Agreement.