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.

A260962 Numbers k such that phi(k) = phi'(k'), where phi(k) is the Euler totient function of k and k' is the arithmetic derivative of k.

Table of values

n a(n)
1 8
2 26
3 122
4 351
5 31195
6 47201
7 51243
8 118265
9 300985
10 472491
11 672147
12 673863
13 850969
14 931383
15 1440625
16 3000927
17 3669213
18 3740755
19 4688645
20 4822143
21 4864175
22 11224565
23 13897079
24 13949343
25 16362857
26 16744355
27 18844265
28 19536205
29 35580099
30 38656975
31 42056215
32 46294105

List of values

[8, 26, 122, 351, 31195, 47201, 51243, 118265, 300985, 472491, 672147, 673863, 850969, 931383, 1440625, 3000927, 3669213, 3740755, 4688645, 4822143, 4864175, 11224565, 13897079, 13949343, 16362857, 16744355, 18844265, 19536205, 35580099, 38656975, 42056215, 46294105]

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

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