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.

A067688 Composite n such that for some integer r, n equals the sum of the r-th powers of the prime factors of n (counted with multiplicity).

Table of values

n a(n)
1 4
2 16
3 27
4 256
5 3125
6 19683
7 65536
8 823543
9 1096744
10 2836295
11 4294967296
12 4473671462
13 23040925705
14 285311670611
15 7625597484987
16 13579716377989
17 119429556097859
18 302875106592253

List of values

[4, 16, 27, 256, 3125, 19683, 65536, 823543, 1096744, 2836295, 4294967296, 4473671462, 23040925705, 285311670611, 7625597484987, 13579716377989, 119429556097859, 302875106592253]

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

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