A118638 Lesser of a twin-prime pair where both are expressible as the sum of two triangular numbers.

11, 29, 137, 191, 461, 659, 821, 1091, 1721, 2027, 2081, 2711, 3359, 3539, 3917, 6131, 6761, 7589, 7877, 7949, 8219, 9461, 9857, 11351, 12107, 12377, 13691, 13997, 14447, 16139, 16229, 17291, 17417, 17579, 18911, 19469, 19541, 19991, 20549, 20639, 20747, 20981

Offset

1,1

Comments

A bisection of A117314. Thought more interesting by Robert G. Wilson v.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Example

a(1) = 11 = 1 + 10;
a(2) = 29 = 1 + 28.

Crossrefs

Cf. A117314, A117313, A117048, A117112, A001097.

Sequence in context: A053703 A216559 A099911 * A088460 A168171 A249993

Adjacent sequences: A118635 A118636 A118637 * A118639 A118640 A118641

Keyword

nonn

Author

Greg Huber, May 09 2006

Extensions

a(40) inserted by Amiram Eldar, Dec 27 2019

Status

approved