A088958 - OEIS

A088958

Numbers n such that 60*n+1 is prime.

1, 3, 4, 7, 9, 10, 11, 17, 20, 22, 23, 27, 29, 30, 31, 36, 37, 38, 39, 42, 50, 51, 52, 53, 55, 56, 59, 67, 70, 71, 74, 76, 77, 80, 81, 85, 88, 92, 93, 94, 95, 97, 98, 102, 105, 106, 107, 108, 111, 113, 114, 116, 122, 126, 127, 128, 129, 135, 136, 137, 141, 142, 143, 144

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5700

FORMULA

a(n) = (A088955(n)-1)/60 = (A000040(A090605(n))-1)/60.

MATHEMATICA

Select[Range[200], PrimeQ[60 # + 1] &] (* Vincenzo Librandi, May 23 2017 *)

PROG

(PARI) isok(n) = isprime(60*n+1) \\ Michel Marcus, Jul 27 2013

(Magma) [n: n in [0..200] | IsPrime(60*n+1)]; // Vincenzo Librandi, May 23 2017