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A093941
Primes of the form 5*10^k + 7*R_k, where R_k is the repunit (A002275) of length k.
2
5, 577, 577777777, 577777777777777, 577777777777777777, 5777777777777777777, 5777777777777777777777777777777777, 577777777777777777777777777777777777
OFFSET
1,1
CROSSREFS
Cf. A002275, A056715 (corresponding k).
Sequence in context: A298651 A299605 A185555 * A072952 A179634 A302379
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Apr 17 2004
STATUS
approved