Integers n such that 10^n-21 is a prime number.
A108327
Integers n such that 10^n-21 is a prime number.
Terms
- a(0) =2a(1) =6a(2) =32a(3) =108a(4) =408a(5) =1286a(6) =2268a(7) =2328a(8) =4284a(9) =53558a(10) =181182a(11) =249010
External references
- oeis: A108327