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.

A291901 Numbers n such that the sum of sums of elements of subsets of divisors of n is a perfect number (A000396).

Table of values

n a(n)
1 2
2 4
3 13
4 16
5 64
6 4096
7 65536
8 262144
9 3145341
10 932181397
11 1073741824
12 1152921504606846976
13 309485009821345068724781056
14 81129638414606681695789005144064
15 85070591730234615865843651857942052864
16 75603657215035519123837860069507929970384679

List of values

[2, 4, 13, 16, 64, 4096, 65536, 262144, 3145341, 932181397, 1073741824, 1152921504606846976, 309485009821345068724781056, 81129638414606681695789005144064, 85070591730234615865843651857942052864, 75603657215035519123837860069507929970384679]

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

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