1,1

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

71 is in the sequence because 71 = 11^2 - 2*5^2 and 71, 11 and 5 are all primes.

Cf. A260806, A260807, A260808, A260809.

Sequence in context: A258029 A321596 A160961 * A267781 A270441 A256374

Adjacent sequences: A260802 A260803 A260804 * A260806 A260807 A260808

nonn

Colin Barker, Jul 31 2015

approved