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.

A237043 Numbers n such that 2^n - 1 is not squarefree, but 2^d - 1 is squarefree for every proper divisor d of n.

Table of values

n a(n)
1 6
2 20
3 21
4 110
5 136
6 155
7 253
8 364
9 602
10 657
11 812
12 889
13 979
14 1081

List of values

[6, 20, 21, 110, 136, 155, 253, 364, 602, 657, 812, 889, 979, 1081]