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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.

A342540 a(n) = Sum_{k=1..n} phi(gcd(k, n))^(n-1).

Table of values

n a(n)
1 1
2 2
3 6
4 11
5 260
6 68
7 46662
8 16518
9 1680134
10 524296
11 10000000010
12 4204550
13 8916100448268
14 26121388044
15 4398583447560
16 35185445896204
17 18446744073709551632
18 33853319413772
19 39346408075296537575442
20 144116012711673868
21 3833767304764361539596
22 2000000000000000000020

List of values

[1, 2, 6, 11, 260, 68, 46662, 16518, 1680134, 524296, 10000000010, 4204550, 8916100448268, 26121388044, 4398583447560, 35185445896204, 18446744073709551632, 33853319413772, 39346408075296537575442, 144116012711673868, 3833767304764361539596, 2000000000000000000020]

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

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