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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.

A321349 a(n) = Sum_{d|n} phi(d^n), where phi() is the Euler totient function (A000010).

Table of values

n a(n)
1 1
2 3
3 19
4 137
5 2501
6 16071
7 705895
8 8421505
9 258293449
10 4007813013
11 259374246011
12 2972767821815
13 279577021469773
14 4762869973595499
15 233543432626753439
16 9223512776490647553
17 778579070010669895697
18 13115569455375954492093
19 1874292305362402347591139

List of values

[1, 3, 19, 137, 2501, 16071, 705895, 8421505, 258293449, 4007813013, 259374246011, 2972767821815, 279577021469773, 4762869973595499, 233543432626753439, 9223512776490647553, 778579070010669895697, 13115569455375954492093, 1874292305362402347591139]

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

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