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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.

A383938 a(n) is the least positive integer k such that b(2*j) is prime for 1 <= j <= n but not prime for j = n+1, where b(1) = k and b(m+1) = b(m) + prime(m) for m >= 1.

Table of values

n a(n)
0 2
1 5
2 21
3 129
4 69
5 1
6 51
7 23991
8 171
9 1371
10 3
11 322141431
12 1431357020859

List of values

[2, 5, 21, 129, 69, 1, 51, 23991, 171, 1371, 3, 322141431, 1431357020859]

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

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