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Lesser of a twin-prime pair where both are expressible as the sum of two triangular numbers.
2

%I #7 Dec 27 2019 11:55:32

%S 11,29,137,191,461,659,821,1091,1721,2027,2081,2711,3359,3539,3917,

%T 6131,6761,7589,7877,7949,8219,9461,9857,11351,12107,12377,13691,

%U 13997,14447,16139,16229,17291,17417,17579,18911,19469,19541,19991,20549,20639,20747,20981

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

%C A bisection of A117314. Thought more interesting by _Robert G. Wilson v_.

%H Amiram Eldar, <a href="/A118638/b118638.txt">Table of n, a(n) for n = 1..10000</a>

%e a(1) = 11 = 1 + 10;

%e a(2) = 29 = 1 + 28.

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

%K nonn

%O 1,1

%A _Greg Huber_, May 09 2006

%E a(40) inserted by _Amiram Eldar_, Dec 27 2019