A093941 Primes of the form 5*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.

5, 577, 577777777, 577777777777777, 577777777777777777, 5777777777777777777, 5777777777777777777777777777777777, 577777777777777777777777777777777777

Offset: 1

Author

Rick L. Shepherd, Apr 17 2004

Keywords

• nonn

Links

• Makoto Kamada, Prime numbers of the form 577...77.
• Index entries for primes involving repunits.

Crossrefs

Cf. A002275, A056715 (corresponding k).