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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.

A120357 a(n) is the smallest prime p such that 2^p-1 (a Mersenne number) contains 10^n or more decimal digits.

Table of values

n a(n)
0 2
1 31
2 331
3 3319
4 33223
5 332191
6 3321937
7 33219281
8 332192831
9 3321928097
10 33219280951
11 332192809589
12 3321928094941
13 33219280948907
14 332192809488739
15 3321928094887411
16 33219280948873687
17 332192809488736253

List of values

[2, 31, 331, 3319, 33223, 332191, 3321937, 33219281, 332192831, 3321928097, 33219280951, 332192809589, 3321928094941, 33219280948907, 332192809488739, 3321928094887411, 33219280948873687, 332192809488736253]

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

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