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A093676 Primes of the form 8*10^k + 3*R_k, where R_k is the repunit (A002275) of length k. 7
83, 83333333, 833333333333333333333333, 833333333333333333333333333333 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

Makoto Kamada, Prime numbers of the form 833...33.

Index entries for primes involving repunits

CROSSREFS

Cf. A002275, A056723 (corresponding k).

Sequence in context: A287686 A087532 A116307 * A221416 A130432 A317437

Adjacent sequences:  A093673 A093674 A093675 * A093677 A093678 A093679

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 08 2004

STATUS

approved

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Last modified August 10 04:49 EDT 2022. Contains 356029 sequences. (Running on oeis4.)