Numbers k such that (5*10^k - 101)/3 is prime.

Terms

a(0) =4a(1) =19a(2) =29a(3) =42a(4) =48a(5) =57a(6) =70a(7) =71a(8) =72a(9) =124a(10) =189a(11) =216a(12) =1860a(13) =4170a(14) =6132a(15) =9226a(16) =9725a(17) =9906a(18) =9942a(19) =15283a(20) =19386a(21) =181950a(22) =219847a(23) =234054