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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.

A237613 Numbers k such that tau(sigma(tau(k))) = sigma(tau(sigma(k))), where tau is A000005 and sigma is A000203.

Table of values

n a(n)
1 1
2 4
3 9
4 25
5 81
6 289
7 1681
8 3481
9 5041
10 7921
11 10201
12 17161
13 27889
14 29929
15 85849
16 146689
17 331776
18 458329
19 491401
20 552049
21 579121
22 597529
23 683929
24 703921
25 734449
26 786432
27 829921
28 1190281
29 1203409
30 1352569
31 1394761
32 1423249
33 1481089
34 1885129
35 2036329
36 2211169

List of values

[1, 4, 9, 25, 81, 289, 1681, 3481, 5041, 7921, 10201, 17161, 27889, 29929, 85849, 146689, 331776, 458329, 491401, 552049, 579121, 597529, 683929, 703921, 734449, 786432, 829921, 1190281, 1203409, 1352569, 1394761, 1423249, 1481089, 1885129, 2036329, 2211169]

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

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