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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.

A092120 a(n) is the first term p in a sequence of primes such that p+4m^2 is prime for m = 0 to n, but composite for m = n+1; a(n) = -1 if no such prime exists.

Table of values

n a(n)
0 2
1 19
2 3
3 277
4 43
5 53593
6 7
7 67
8 37
9 1483087
10 1867783
11 9671300983
12 376040154163
13 13491637509487
14 604490757900187
15 409333

List of values

[2, 19, 3, 277, 43, 53593, 7, 67, 37, 1483087, 1867783, 9671300983, 376040154163, 13491637509487, 604490757900187, 409333]

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

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