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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.

A226459 a(n) = Sum_{d|n} phi(d^d), where phi(n) is the Euler totient function A000010(n).

Table of values

n a(n)
1 1
2 3
3 19
4 131
5 2501
6 15573
7 705895
8 8388739
9 258280345
10 4000002503
11 259374246011
12 2972033498453
13 279577021469773
14 4762288640230761
15 233543408203127519
16 9223372036863164547
17 778579070010669895697
18 13115469358432437487707
19 1874292305362402347591139

List of values

[1, 3, 19, 131, 2501, 15573, 705895, 8388739, 258280345, 4000002503, 259374246011, 2972033498453, 279577021469773, 4762288640230761, 233543408203127519, 9223372036863164547, 778579070010669895697, 13115469358432437487707, 1874292305362402347591139]

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

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