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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.

A351921 a(n) is the smallest nonzero number k such that gcd(prime(1)^k + 1, prime(2)^k + 1, ..., prime(n)^k + 1) > 1 and gcd(prime(1)^k + 1, prime(2)^k + 1, ..., prime(n+1)^k + 1) = 1.

Table of values

n a(n)
2 2
3 26
4 21
5 86
6 33
7 1238
8 4401
9 4586
10 16161
11 18561
12 81
13 37046
14 85478
15 180146
16 339866

List of values

[2, 26, 21, 86, 33, 1238, 4401, 4586, 16161, 18561, 81, 37046, 85478, 180146, 339866]

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

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