Primes with exactly five 5's.

Terms

a(0) =555557a(1) =1555553a(2) =2555551a(3) =3555551a(4) =3555557a(5) =4555559a(6) =5055551a(7) =5055559a(8) =5355551a(9) =5505551a(10) =5535559a(11) =5550553a(12) =5550557a(13) =5554553a(14) =5555057a(15) =5555059a(16) =5555357a(17) =5555507a(18) =5555509a(19) =5555527a(20) =5555567a(21) =5555591a(22) =5555653a(23) =5556557a(24) =5556559a(25) =5557553