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

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =29a(5) =39a(6) =114a(7) =484a(8) =865a(9) =4180a(10) =5385a(11) =13122a(12) =13832a(13) =22676a(14) =25020a(15) =30057a(16) =35910a(17) =37935a(18) =42295a(19) =50194a(20) =110076a(21) =184124a(22) =191152