Numbers k such that (23*10^k - 143)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =6a(3) =7a(4) =14a(5) =22a(6) =31a(7) =33a(8) =42a(9) =51a(10) =799a(11) =934a(12) =1996a(13) =3372a(14) =3570a(15) =3883a(16) =4417a(17) =4747a(18) =4965a(19) =5055a(20) =5647a(21) =7183a(22) =19702a(23) =42124a(24) =180862a(25) =187164