A065245 Positive numbers k such that 2 + Sum_{j = 1..k} j^2 is a prime.

1, 2, 13, 17, 18, 21, 22, 25, 26, 34, 45, 49, 57, 70, 74, 85, 89, 90, 94, 101, 129, 134, 146, 165, 166, 174, 189, 209, 234, 241, 250, 277, 301, 326, 333, 342, 358, 369, 377, 381, 382, 386, 390, 413, 426, 441, 458, 470, 477, 486, 489, 490, 493, 522, 525, 529

Offset

1,2

Comments

Values of m in A065244.

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Prog

(PARI) { n=s=0; for (m = 1, 10^9, s+=m^2; if (isprime(2 + s), write("b065245.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Oct 14 2009

Crossrefs

Cf. A000330, A065244.

Sequence in context: A257636 A258317 A318911 * A158845 A163786 A153507

Adjacent sequences: A065242 A065243 A065244 * A065246 A065247 A065248

Keyword

nonn

Author

Labos Elemer, Oct 24 2001

Status

approved