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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.

A089158 Second prime factor, if it exists, of Mersenne numbers.

Table of values

n a(n)
1 89
2 178481
3 1103
4 616318177
5 164511353
6 9719
7 4513
8 69431
9 3203431780337
10 761838257287
11 48544121
12 2298041
13 202029703
14 57912614113275649087721
15 13842607235828485645766393
16 341117531003194129
17 3976656429941438590393

List of values

[89, 178481, 1103, 616318177, 164511353, 9719, 4513, 69431, 3203431780337, 761838257287, 48544121, 2298041, 202029703, 57912614113275649087721, 13842607235828485645766393, 341117531003194129, 3976656429941438590393]

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

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