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A093631 Primes of the form 6*10^n + R_n, where R_n is the repunit (A002275) of length n. 1
61, 611111, 61111111, 61111111111111111111111111, 61111111111111111111111111111111, 61111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 (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 611...11.

Index entries for primes involving repunits

CROSSREFS

Cf. A002275, A056717 (corresponding n).

Sequence in context: A058996 A116124 A068533 * A087513 A176272 A173418

Adjacent sequences:  A093628 A093629 A093630 * A093632 A093633 A093634

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Apr 06 2004

STATUS

approved

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Last modified June 18 16:46 EDT 2019. Contains 324214 sequences. (Running on oeis4.)