A173230 - OEIS

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A173230

Primes p of the form 6k+1 such that 6p+1 is also prime.

7, 13, 37, 61, 73, 103, 151, 181, 241, 271, 277, 283, 313, 331, 367, 373, 397, 577, 601, 607, 661, 727, 751, 787, 853, 907, 937, 1033, 1063, 1117, 1171, 1201, 1321, 1327, 1381, 1423, 1453, 1531, 1567, 1693, 1777, 1831, 1873, 1987, 1993, 2137, 2161, 2203, 2221, 2281, 2287, 2293, 2347, 2551, 2593, 2677, 2767, 2791, 2851, 2971, 3037, 3061, 3163, 3181, 3307, 3391

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..66.

MATHEMATICA

sp1Q[n_]:=IntegerQ[(n-1)/6]&&PrimeQ[6n+1]; Select[Prime[Range[500]], sp1Q] (* Harvey P. Dale, Apr 08 2018 *)

PROG

(Magma) [ p: n in [0..600] | IsPrime(6*p+1) and IsPrime(p) where p is 6*n+1 ];

CROSSREFS

Subsequence of A007693 which in turn is subsequence of A024899.

Sequence in context: A307762 A290947 A267985 * A361483 A155036 A088985

Adjacent sequences: A173227 A173228 A173229 * A173231 A173232 A173233

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 22 2010

STATUS

approved