A114257 Numbers n such that A014285(n) is prime.

1, 3, 32, 63, 67, 75, 88, 99, 104, 115, 116, 120, 135, 144, 159, 167, 179, 188, 192, 195, 199, 204, 227, 239, 244, 260, 280, 283, 304, 323, 335, 348, 351, 379, 380, 384, 396, 412, 424, 436, 443, 503, 508, 523, 579, 632, 648, 651, 695, 723, 724, 736, 743, 752

Offset: 1

Author

Zak Seidov, Nov 18 2005

Keywords

• nonn

Crossrefs

Cf. A014285 (Sum i*prime(i); i=1..n), A114256 (Prime numbers in A014285).

Programs

PARI

isok(n) = isprime(sum(i=1, n, i*prime(i))); \\ Michel Marcus, May 25 2018