A260807 Primes p such that p = q^2 - 8*r^2 where q and r are also primes.

89, 97, 137, 257, 449, 457, 569, 641, 761, 769, 809, 929, 977, 1289, 1297, 1481, 1609, 1777, 2129, 2137, 2417, 2609, 2729, 2753, 2777, 3089, 3137, 3329, 3449, 3929, 4001, 4073, 4289, 4457, 4649, 4889, 4937, 4969, 5009, 5273, 5297, 5849, 6521, 6569, 6689

Offset

1,1

Links

Colin Barker, Table of n, a(n) for n = 1..1000

Example

449 is in the sequence because 449 = 29^2 - 8*7^2 and 449, 29 and 7 are all primes.

Crossrefs

Cf. A260805, A260806, A260808, A260809.

Sequence in context: A373915 A088993 A107202 * A178917 A159026 A256240

Adjacent sequences: A260804 A260805 A260806 * A260808 A260809 A260810

Keyword

nonn

Author

Colin Barker, Jul 31 2015

Status

approved