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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
Makoto Kamada, Prime numbers of the form 577...77.
Index entries for primes involving repunits.
CROSSREFS
Cf. A002275, A056715 (corresponding k).
Sequence in context: A298651 A299605 A185555 * A072952 A179634 A302379
Adjacent sequences: A093938 A093939 A093940 * A093942 A093943 A093944
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Apr 17 2004
STATUS
approved

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Last modified May 13 21:51 EDT 2024. Contains 372523 sequences. (Running on oeis4.)