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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.

A254320 Numbers k such that the reversal of phi(k) is sigma(k)-k.

Table of values

n a(n)
1 2
2 11
3 101
4 735
5 7665
6 11505
7 16459
8 64578
9 378871
10 541033
11 3440409
12 5639353
13 5230000213
14 5762782573
15 5828558173
16 8130408803
17 8275586723
18 9738107377
19 11263073973
20 37057275961
21 38914628453
22 58285958173
23 231243884637
24 350649946051
25 380047486211
26 516420024613
27 547083380743
28 576216622573

List of values

[2, 11, 101, 735, 7665, 11505, 16459, 64578, 378871, 541033, 3440409, 5639353, 5230000213, 5762782573, 5828558173, 8130408803, 8275586723, 9738107377, 11263073973, 37057275961, 38914628453, 58285958173, 231243884637, 350649946051, 380047486211, 516420024613, 547083380743, 576216622573]

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

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