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A260807 Primes p such that p = q^2 - 8*r^2 where q and r are also primes. 5
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 (list; graph; refs; listen; history; text; internal format)
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: A253648 A088993 A107202 * A178917 A159026 A256240

Adjacent sequences:  A260804 A260805 A260806 * A260808 A260809 A260810

KEYWORD

nonn

AUTHOR

Colin Barker, Jul 31 2015

STATUS

approved

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)