A102982 - OEIS

This site is supported by donations to The OEIS Foundation.

A102982

Numbers n such that 4*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

1, 4, 84, 165, 274, 513, 3372, 4177, 4318, 10579, 17221, 19672, 20065 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (37*10^n+53)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 411...117.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(37*10^n + 53)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A056410 A056400 A119514 * A172138 A178208 A069441` `Adjacent sequences: A102979 A102980 A102981 * A102983 A102984 A102985`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 21 2004`
	EXTENSIONS	`Addition of a(10)-a(13) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 13 2010`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 18:43 EST 2012. Contains 205939 sequences.