Initial prime of 4 primes in arithmetic progression with difference 12.

Terms

a(0) =5a(1) =7a(2) =17a(3) =47a(4) =127a(5) =227a(6) =257a(7) =397a(8) =467a(9) =607a(10) =997a(11) =1447a(12) =1487a(13) =1697a(14) =1877a(15) =2647a(16) =3307a(17) =3547a(18) =3907a(19) =4217a(20) =4987a(21) =5407a(22) =6287a(23) =6947a(24) =7297a(25) =7537a(26) =7817a(27) =10067a(28) =10627a(29) =11047