A085958 Primes p such that 8p +1 and (p-1)/8 are primes.

17, 137, 809, 857, 3209, 6569, 7577, 9209, 11897, 16217, 17657, 19289, 21929, 23417, 30809, 35129, 37529, 41849, 46889, 53609, 56009, 66377, 70457, 74729, 76697, 78809, 80537, 88937, 91577, 95177, 96857, 103289, 129497, 141257, 165449, 166169

Offset

1,1

Links

Table of n, a(n) for n=1..36.

Example

137 is a term as (137-1)/8 = 17 and 137*8 +1 = 1097 both are primes.

Mathematica

Prime[ Select[ Range[15208], PrimeQ[ 8Prime[ # ] + 1] && PrimeQ[(Prime[ # ] - 1)/8] & ]]
Select[Prime[Range[16000]], PrimeQ[8#+1]&&PrimeQ[(#-1)/8]&] (* Harvey P. Dale, Jan 23 2013 *)

Crossrefs

Cf. A085956, A085957.

Sequence in context: A142788 A361150 A244874 * A120784 A357550 A271395

Adjacent sequences: A085955 A085956 A085957 * A085959 A085960 A085961

Keyword

nonn

Author

Amarnath Murthy, Jul 16 2003

Extensions

Edited and extended by Zak Seidov and Robert G. Wilson v, Jul 18 2003

Status

approved