cp's OEIS Frontend

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.

A238981 Sum of n-th powers of unitary divisors of n (d such that d divides n, gcd(d, n/d) = 1).

Table of values

n a(n)
1 1
2 5
3 28
4 257
5 3126
6 47450
7 823544
8 16777217
9 387420490
10 10009766650
11 285311670612
12 8916117756914
13 302875106592254
14 11112685048647250
15 437893920912786408
16 18446744073709551617
17 827240261886336764178
18 39346558169931834836690
19 1978419655660313589123980

List of values

[1, 5, 28, 257, 3126, 47450, 823544, 16777217, 387420490, 10009766650, 285311670612, 8916117756914, 302875106592254, 11112685048647250, 437893920912786408, 18446744073709551617, 827240261886336764178, 39346558169931834836690, 1978419655660313589123980]

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

Content is available under The OEIS End-User License Agreement.