Primes equal to a pentagonal number plus 1.

Terms

a(0) =2a(1) =13a(2) =23a(3) =71a(4) =211a(5) =331a(6) =853a(7) =1163a(8) =1427a(9) =2381a(10) =2753a(11) =3433a(12) =3877a(13) =5923a(14) =6113a(15) =6701a(16) =7741a(17) =8627a(18) =9323a(19) =11311a(20) =12377a(21) =14653a(22) =14951a(23) =17443a(24) =18427a(25) =23003a(26) =27271a(27) =31033a(28) =32341a(29) =32783