Numbers k such that (7*10^k - 13)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =28a(5) =53a(6) =56a(7) =86a(8) =88a(9) =90a(10) =96a(11) =136a(12) =142a(13) =186a(14) =202a(15) =373a(16) =448a(17) =785a(18) =988a(19) =1263a(20) =1966a(21) =3561a(22) =4768a(23) =9658a(24) =9831a(25) =17797a(26) =42286a(27) =49893a(28) =98007a(29) =129472