A138250 - OEIS

A138250

Prime numbers k such that 30*k - 1, 30*k + 1 are twin primes.

2, 5, 19, 41, 43, 71, 113, 131, 167, 223, 229, 281, 331, 383, 457, 461, 467, 509, 541, 593, 797, 839, 937, 947, 971, 1009, 1013, 1087, 1097, 1153, 1231, 1289, 1471, 1553, 1559, 1699, 1787, 2003, 2099, 2113, 2617, 2683, 2689, 2731, 2749, 2861, 2879, 2917

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

OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

2*30 - 1 = 59 (prime), 2*30 + 1 = 61 (prime).

MATHEMATICA

a=30; Select[Prime[Range[250]], PrimeQ[a*#-1]&&PrimeQ[a*#+1] &]

PROG

(Magma) [n: n in [0..10000] |IsPrime(n) and IsPrime(30*n-1)and IsPrime(30*n+1)] // Vincenzo Librandi, Aug 03 2010

CROSSREFS