%I #8 Dec 15 2017 17:36:33
%S 17,59,137,149,1277,1619,2729,4127,6359,11717,13397,17489,20807,23027,
%T 28307,29669,51869,61379,69827,73847,78539,92567,97499,115769,138569,
%U 166667,176609,193379,200927,258317,304979,430007,500909,518759,536189
%N Smaller member of a twin prime pair with a triangular sum.
%C It is easily shown that all terms end in 7 or 9.
%H Harvey P. Dale, <a href="/A086816/b086816.txt">Table of n, a(n) for n = 0..300</a>
%e 59 is a term because it is the smaller member of the twin prime pair (59,61) and 59 + 61 = 120 = 15*(15+1)/2.
%t Transpose[Select[Partition[Prime[Range[45000]],2,1],#[[2]]#[[1]]==2 && IntegerQ[(Sqrt[1+8Total[#]]1)/2]&]][[1]] (* _Harvey P. Dale_, Dec 15 2011 *)
%Y Cf. A000217, A001359.
%K nonn
%O 0,1
%A _Jason Earls_, Aug 06 2003
