Primes of the form 10*n+1.

Terms

a(0) =11a(1) =31a(2) =41a(3) =61a(4) =71a(5) =101a(6) =131a(7) =151a(8) =181a(9) =191a(10) =211a(11) =241a(12) =251a(13) =271a(14) =281a(15) =311a(16) =331a(17) =401a(18) =421a(19) =431a(20) =461a(21) =491a(22) =521a(23) =541a(24) =571a(25) =601a(26) =631a(27) =641a(28) =661a(29) =691