Primes which are a sandwich of numbers made of only one digit between two 7's.
A068688
Primes which are a sandwich of numbers made of only one digit between two 7's.
Terms
- a(0) =727a(1) =757a(2) =787a(3) =797a(4) =72227a(5) =75557a(6) =76667a(7) =78887a(8) =79997a(9) =7666667a(10) =722222227a(11) =74444444447a(12) =75555555557
External references
- oeis: A068688