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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.

A226561 a(n) = Sum_{d|n} d^n * phi(d), where phi(n) is the Euler totient function A000010(n).

Table of values

n a(n)
1 1
2 5
3 55
4 529
5 12501
6 94835
7 4941259
8 67240193
9 2324562301
10 40039063525
11 2853116706111
12 35668789979107
13 3634501279107037
14 66676110291801575
15 3503151245145885315
16 147575078498173255681
17 13235844190181388226833
18 236079349222711695887225
19 35611553801885644604231623

List of values

[1, 5, 55, 529, 12501, 94835, 4941259, 67240193, 2324562301, 40039063525, 2853116706111, 35668789979107, 3634501279107037, 66676110291801575, 3503151245145885315, 147575078498173255681, 13235844190181388226833, 236079349222711695887225, 35611553801885644604231623]

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

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