Numbers k such that (10^k + 23)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =6a(3) =146a(4) =326a(5) =380a(6) =1116a(7) =1866a(8) =4808a(9) =5528a(10) =5730a(11) =21836a(12) =24804a(13) =38724