Numbers n such that (10^(2n+1)+72*10^n-1)/9 is prime.
A107649
Numbers n such that (10^(2n+1)+72*10^n-1)/9 is prime.
Terms
- a(0) =1a(1) =4a(2) =26a(3) =187a(4) =226a(5) =874a(6) =13309a(7) =34016a(8) =42589
External references
- oeis: A107649
A107649
Numbers n such that (10^(2n+1)+72*10^n-1)/9 is prime.