Numbers n such that 7*10^n + 3 is prime.

Terms

a(0) =1a(1) =4a(2) =6a(3) =16a(4) =22a(5) =39a(6) =103a(7) =163a(8) =240a(9) =1048a(10) =1974a(11) =2559a(12) =5880a(13) =14436a(14) =28338a(15) =32796a(16) =38079a(17) =56779a(18) =91215a(19) =111325a(20) =115863a(21) =138604