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A092571 Primes of the form 60*R_k + 1, where R_k is the repunit (A002275) of length k. 8
61, 661, 6661, 6666666661, 666666666666666661, 666666666666666666661, 6666666666666666666661, 6666666666666666666666666661, 6666666666666666666666666666666666666666661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The number of 6's in each term is given by the corresponding term of A056658.

Primes of the form (6*10^k - 51)/9. - Vincenzo Librandi, Nov 17 2010

LINKS

Table of n, a(n) for n=1..9.

Makoto Kamada, Prime numbers of the form 66...661.

Index entries for primes involving repunits

CROSSREFS

Cf. A056658 (corresponding k).

Sequence in context: A317462 A283869 A173805 * A119597 A132388 A086945

Adjacent sequences: A092568 A092569 A092570 * A092572 A092573 A092574

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Feb 28 2004

STATUS

approved

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Last modified December 10 02:09 EST 2022. Contains 358712 sequences. (Running on oeis4.)