Happy-go-Lucky primes: primes arising in A091431.

Terms

a(0) =7a(1) =13a(2) =31a(3) =79a(4) =193a(5) =331a(6) =367a(7) =409a(8) =487a(9) =673a(10) =739a(11) =937a(12) =1009a(13) =1039a(14) =1093a(15) =1303a(16) =1663a(17) =1933a(18) =2221a(19) =2557a(20) =2851a(21) =3109a(22) =3301a(23) =3313a(24) =3607a(25) =3709a(26) =3931a(27) =4363a(28) =4441a(29) =4663