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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.

A144671 Numbers n such that omega(n) = omega(2^n-1), where omega = A001221 = number of distinct prime factors.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 6
6 7
7 13
8 17
9 19
10 31
11 61
12 89
13 107
14 127
15 521
16 607

List of values

[1, 2, 3, 5, 6, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607]

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

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