Primes p such that p+2, p*(p+1)/2-2 and p*(p+1)/2+2 are also primes.

Terms

a(0) =5a(1) =41a(2) =149a(3) =281a(4) =641a(5) =1301a(6) =1481a(7) =3329a(8) =3821a(9) =4421a(10) =5849a(11) =6761a(12) =10529a(13) =12161a(14) =17489a(15) =32969a(16) =36341a(17) =41609a(18) =43889a(19) =51341a(20) =63389a(21) =64661a(22) =67409a(23) =70121a(24) =84629a(25) =89069a(26) =94529a(27) =104309a(28) =108881a(29) =129401