Numbers n such that 99 * 10^n + 1 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =20a(6) =24a(7) =72a(8) =200a(9) =359a(10) =454a(11) =624a(12) =1054a(13) =2060a(14) =6301a(15) =8083a(16) =8407a(17) =13159a(18) =65059a(19) =74957