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A093942 Primes of the form 6*10^n + 7*R_n, where R_n is the repunit (A002275) of length n. 0
67, 677, 67777, 67777777777, 67777777777777, 67777777777777777777777777, 67777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The next term is too large to display (see A056718).

LINKS

Table of n, a(n) for n=1..7.

Makoto Kamada, Prime numbers of the form 677...77.

Index entries for primes involving repunits.

CROSSREFS

Cf. A056718 (corresponding n).

Sequence in context: A142139 A178004 A106106 * A166802 A212557 A254640

Adjacent sequences:  A093939 A093940 A093941 * A093943 A093944 A093945

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 17 2004

STATUS

approved

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Last modified July 23 11:44 EDT 2019. Contains 325254 sequences. (Running on oeis4.)