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A093139 Primes of the form 10*R_n + 7, where R_n is the repunit (A002275) of length n. 1
7, 17, 1117, 11117, 11111117, 11111111111111111111117, 11111111111111111111111111117, 1111111111111111111111111111111111111117 (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 11...117.

Index entries for primes involving repunits

CROSSREFS

Cf. A056655 (corresponding n).

Sequence in context: A013540 A153375 A001145 * A177366 A138491 A022511

Adjacent sequences:  A093136 A093137 A093138 * A093140 A093141 A093142

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Mar 23 2004

STATUS

approved

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Last modified March 19 04:34 EDT 2019. Contains 321311 sequences. (Running on oeis4.)