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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.

A258937 Define f_i as the i-th iterate of A260187. a(n) is the least prime for which f_i(a(n)) is prime for all i such that 0 <= i < n and f_n(a(n)) is not prime.

Table of values

n a(n)
1 2
2 11
3 41
4 251
5 2579
6 32609
7 543131
8 10243031
9 233336819
10 6703033091
11 207263540933
12 7628002016027
13 311878266460847
14 13394639616667427
15 628284422215925129
16 33217442899664876729
17 1955977793054900415107
18 119244359152469819863541

List of values

[2, 11, 41, 251, 2579, 32609, 543131, 10243031, 233336819, 6703033091, 207263540933, 7628002016027, 311878266460847, 13394639616667427, 628284422215925129, 33217442899664876729, 1955977793054900415107, 119244359152469819863541]

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

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