Primes of the form 4*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
A093940
Primes of the form 4*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
Terms
- a(0) =47a(1) =47777
External references
- oeis: A093940
A093940
Primes of the form 4*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.