Primes of the form 50*R_k + 9, where R_k is the repunit (A002275) of length k.

A093403

Primes of the form 50*R_k + 9, where R_k is the repunit (A002275) of length k.

Terms

    a(0) =59a(1) =55555559a(2) =555555555559

External references