A106060 - OEIS

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A106060

Primes p such that 1*p + 8 and 8*p + 1 are primes.

5, 11, 29, 71, 101, 131, 149, 269, 401, 431, 449, 479, 491, 599, 761, 821, 929, 1229, 1289, 1559, 1571, 1601, 1619, 1871, 2081, 2129, 2339, 2531, 2549, 2609, 2741, 3041, 3209, 3299, 3461, 3719, 3761, 4289, 5189, 5861, 6269, 6359, 6569, 6701, 6959, 7211

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

OFFSET

1,1

COMMENTS

Cf. A045536: Primes p such that 1*p+2 and 2*p+1 are prime; A007693: Numbers n such that n and 6*n+1 are primes.

LINKS

Table of n, a(n) for n=1..46.

MATHEMATICA

Select[Prime[Range[220]], PrimeQ[8#+1]&&PrimeQ[1#+8]&]

PROG

(Magma) [p: p in PrimesUpTo(10000) | IsPrime(p+8) and IsPrime(8*p+1)]; // Vincenzo Librandi, Nov 13 2010

CROSSREFS