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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.

A242999 Mersenne prime exponents p in A000043 such that R=2^k-1+(2^k-2)/(2^(p-k)-1) is prime for some k < p, listed with multiplicity (number of k's), see A243003 for the k-values.

Table of values

n a(n)
1 3
2 5
3 7
4 7
5 13
6 17
7 19
8 19
9 31
10 31
11 61
12 89

List of values

[3, 5, 7, 7, 13, 17, 19, 19, 31, 31, 61, 89]

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