Primes of the form p^2 +3p + 1, where p is also a prime.

Terms

a(0) =11a(1) =19a(2) =41a(3) =71a(4) =419a(5) =599a(6) =929a(7) =1481a(8) =1979a(9) =2351a(10) =2969a(11) =3659a(12) =4691a(13) =13109a(14) =19181a(15) =19739a(16) =25121a(17) =27059a(18) =30449a(19) =32579a(20) =53129a(21) =57839a(22) =66821a(23) =69959a(24) =86729a(25) =98909a(26) =122849a(27) =125669a(28) =129959a(29) =140249