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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.

A128608 a(n)=sigma(A128607(n)), where A128607(n) is the sequence of perfect (or pure) powers such that a(n) is a perfect power.

Table of values

n a(n)
1 1
2 121
3 400
4 961
5 116281
6 2989441
7 7958041
8 361722361
9 962922961
10 1902442689
11 1891467081
12 5168743489
13 4755619521
14 5215583961
15 6835486329
16 7496615889
17 13884144561
18 13884144561
19 35018011161
20 120776405841
21 120776405841
22 230195565369
23 253358202409
24 171651947481

List of values

[1, 121, 400, 961, 116281, 2989441, 7958041, 361722361, 962922961, 1902442689, 1891467081, 5168743489, 4755619521, 5215583961, 6835486329, 7496615889, 13884144561, 13884144561, 35018011161, 120776405841, 120776405841, 230195565369, 253358202409, 171651947481]

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

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