Numbers k such that (26*10^k + 31)/3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =7a(6) =9a(7) =57a(8) =98a(9) =122a(10) =123a(11) =249a(12) =304a(13) =318a(14) =339a(15) =374a(16) =390a(17) =476a(18) =619a(19) =1358a(20) =1724a(21) =3351a(22) =5046a(23) =5572a(24) =6685a(25) =9421a(26) =14362a(27) =97353