Irregular triangle, read by rows, of primes with suffix n and digits "3" prepended , otherwise 0.

Terms

a(0) =31a(1) =331a(2) =3331a(3) =33331a(4) =333331a(5) =3333331a(6) =33333331a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =37a(13) =337a(14) =0a(15) =0a(16) =0a(17) =311a(18) =0a(19) =313a(20) =3313a(21) =0a(22) =0a(23) =0a(24) =317a(25) =0a(26) =0a(27) =0a(28) =0a(29) =0