Primes of the form 60*R_k + 1, where R_k is the repunit (A002275) of length k.

A092571

Primes of the form 60*R_k + 1, where R_k is the repunit (A002275) of length k.

Terms

    a(0) =61a(1) =661a(2) =6661a(3) =6666666661

External references