Numbers n such that n*10^n - 1 is prime.

Terms

a(0) =2a(1) =3a(2) =8a(3) =11a(4) =15a(5) =39a(6) =60a(7) =72a(8) =77a(9) =117a(10) =183a(11) =252a(12) =396a(13) =1745a(14) =2843a(15) =4665a(16) =5364a(17) =524427