Primes obtained from other primes by prefixing a 5.

Terms

a(0) =53a(1) =523a(2) =541a(3) =547a(4) =571a(5) =5101a(6) =5107a(7) =5113a(8) =5167a(9) =5179a(10) =5197a(11) =5227a(12) =5233a(13) =5281a(14) =5347a(15) =5419a(16) =5431a(17) =5443a(18) =5449a(19) =5479a(20) =5503a(21) =5521a(22) =5557a(23) =5563a(24) =5569a(25) =5641a(26) =5647a(27) =5653a(28) =5659a(29) =5683