A093171 - OEIS

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A093171

Primes of the form 80*R_k + 7, where R_k is the repunit (A002275) of length k.

7, 887, 8887, 888887, 888888887, 888888888887, 888888888888888888888888888888888888888888888888888888888888888888888887 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Primes of the form (8*10^k - 17)/9. - Vincenzo Librandi, Nov 16 2010`
	LINKS	`Table of n, a(n) for n=1..7.` `Makoto Kamada, Prime numbers of the form 88...887.` `Index entries for primes involving repunits`
	CROSSREFS	`Cf. A056695 (corresponding k), A096846.` `Sequence in context: A193342 A298301 A332187 * A330295 A177908 A127102` `Adjacent sequences: A093168 A093169 A093170 * A093172 A093173 A093174`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd, Mar 26 2004`
	STATUS	`approved`

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Last modified February 4 20:58 EST 2023. Contains 360082 sequences. (Running on oeis4.)