Primes with digit sum = 31.

Terms

a(0) =4999a(1) =6997a(2) =7699a(3) =7789a(4) =7879a(5) =8599a(6) =8689a(7) =8779a(8) =8887a(9) =9679a(10) =9697a(11) =9769a(12) =9787a(13) =9859a(14) =9949a(15) =9967a(16) =13999a(17) =15889a(18) =16699a(19) =16879a(20) =16987a(21) =17599a(22) =17959a(23) =17977a(24) =18679a(25) =18787a(26) =18859a(27) =19489a(28) =19597a(29) =19687