Primes p of the form penta(n)-3, where penta(n) is the n-th pentagonal number.

Terms

a(0) =2a(1) =19a(2) =67a(3) =89a(4) =173a(5) =373a(6) =587a(7) =1423a(8) =2377a(9) =2749a(10) =2879a(11) =4027a(12) =4507a(13) =4673a(14) =5189a(15) =6899a(16) =7523a(17) =8623a(18) =9319a(19) =10289a(20) =12373a(21) =12647a(22) =13487a(23) =14947a(24) =15859a(25) =17117a(26) =18757a(27) =19777a(28) =20123a(29) =21179