Numbers n such that 2*10^n+11 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =9a(6) =19a(7) =25a(8) =39a(9) =63a(10) =133a(11) =157a(12) =274a(13) =943a(14) =1009a(15) =1353a(16) =7297a(17) =16221a(18) =25256a(19) =30424a(20) =52147