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

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 26 17:16 EDT 2020. Contains 334630 sequences. (Running on oeis4.)