A051645 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A051645

Primes p such that 30*p+1 is also prime.

2, 5, 7, 11, 19, 23, 41, 43, 61, 67, 71, 79, 89, 109, 113, 131, 137, 167, 181, 193, 223, 229, 233, 277, 281, 313, 317, 331, 337, 359, 383, 439, 443, 457, 461, 467, 491, 503, 509, 541, 547, 593, 599, 607, 641, 691, 701, 733, 739, 743, 751, 769, 797, 821, 823

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

OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

A002110(3)*p+1 and p are primes.

p=19 is in the sequence because also 30*p+1=571 is prime.

MATHEMATICA

Select[Prime[Range[900]], PrimeQ[30 # + 1] &] (* Vincenzo Librandi, Apr 11 2013 *)

PROG

(Magma) [p: p in PrimesUpTo(900) | IsPrime(30*p+1)]; // Vincenzo Librandi, Apr 11 2013