Primes having only {0, 1, 5} as digits.

Terms

a(0) =5a(1) =11a(2) =101a(3) =151a(4) =1051a(5) =1151a(6) =1511a(7) =5011a(8) =5051a(9) =5101a(10) =5501a(11) =10111a(12) =10151a(13) =10501a(14) =11551a(15) =15101a(16) =15511a(17) =15551a(18) =50051a(19) =50101a(20) =50111a(21) =50551a(22) =51001a(23) =51151a(24) =51511a(25) =51551a(26) =55001a(27) =55051a(28) =55501a(29) =55511