A079812 - OEIS

A079812

Lower of twin primes (p,p+2) such that (p*(p+2))^2 + p^2 - (p+2)^2 and (p*(p+2))^2 - p^2 + (p+2)^2 are both prime.

5, 5477, 20897, 27689, 36341, 39239, 43649, 51971, 77549, 109661, 121631, 122399, 152027, 153509, 159977, 163481, 189947, 211061, 245981, 285977, 308489, 470087, 497279, 512591, 520631, 522281, 560639, 570461, 573899, 580031, 581729, 591089, 616139, 622187, 659171

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..35.

EXAMPLE

a(1) = 5 since 5 and 5+2=7 are primes and (5*7)^2 + 5^2 - 7^2 = 1201 and (5*7)^2 - 5^2 + 7^2 = 1249 are both primes.

CROSSREFS

Cf. A001359, A079797.

Sequence in context: A072021 A196627 A013535 * A137694 A292334 A202156

Adjacent sequences: A079809 A079810 A079811 * A079813 A079814 A079815

KEYWORD

easy,nonn

AUTHOR

Olivier Gérard, Feb 19 2003

STATUS

approved