Chen primes p such that p + 2 is triangular.

Terms

a(0) =13a(1) =19a(2) =53a(3) =89a(4) =251a(5) =701a(6) =1709a(7) =1889a(8) =2699a(9) =5669a(10) =12401a(11) =13859a(12) =18719a(13) =38501a(14) =49139a(15) =60029a(16) =104651a(17) =114479a(18) =146609a(19) =158201a(20) =188189a(21) =226799a(22) =258119a(23) =371951a(24) =385001a(25) =497501a(26) =597869a(27) =665279a(28) =954269a(29) =1034639