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A093943 Primes of the form 8*10^k + 7*R_k, where R_k is the repunit (A002275) of length k. 1
877, 8777777777, 8777777777777777, 877777777777777777777777777777777, 877777777777777777777777777777777777777, 877777777777777777777777777777777777777777777777777777777777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

Makoto Kamada, Prime numbers of the form 877...77.

Index entries for primes involving repunits

CROSSREFS

Cf. A002275, A056724 (corresponding k).

Sequence in context: A208787 A208587 A208472 * A252437 A129313 A063051

Adjacent sequences:  A093940 A093941 A093942 * A093944 A093945 A093946

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 17 2004

STATUS

approved

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Last modified July 3 19:26 EDT 2022. Contains 355055 sequences. (Running on oeis4.)