Primes that contain only the digits (0, 7, 9).

Terms

a(0) =7a(1) =79a(2) =97a(3) =709a(4) =797a(5) =907a(6) =977a(7) =997a(8) =7079a(9) =7907a(10) =9007a(11) =9907a(12) =70009a(13) =70079a(14) =70099a(15) =70709a(16) =70979a(17) =70997a(18) =70999a(19) =77797a(20) =77977a(21) =77999a(22) =79777a(23) =79907a(24) =79979a(25) =79997a(26) =79999a(27) =90007a(28) =90709a(29) =90907