Primes in carryless arithmetic mod 10 in which all digits except the rightmost are zero or five.

Terms

a(0) =51a(1) =52a(2) =53a(3) =54a(4) =56a(5) =57a(6) =58a(7) =59a(8) =551a(9) =553a(10) =557a(11) =559a(12) =5051a(13) =5053a(14) =5057a(15) =5059a(16) =5501a(17) =5503a(18) =5507a(19) =5509a(20) =50051a(21) =50053a(22) =50057a(23) =50059a(24) =55001a(25) =55003a(26) =55007a(27) =55009a(28) =55551a(29) =55553