A102973 - OEIS

This site is supported by donations to The OEIS Foundation.

A102973

Numbers n such that 3*10^n + 5*R_n + 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.

0, 2, 3, 5, 8, 14, 77, 195, 218, 957, 1052, 1163, 1485, 1731, 1970, 3237, 17354 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that (32*10^n+31)/9 is prime.`
	LINKS	`Makoto Kamada, Factorizations of 355...559.` `Index entries for primes involving repunits.`
	MATHEMATICA	`Do[ If[ PrimeQ[(32*10^n+31)/9], Print[n]], {n, 0, 10000}]`
	CROSSREFS	`Sequence in context: A196118 A104880 A152478 * A066372 A058519 A181065` `Adjacent sequences: A102970 A102971 A102972 * A102974 A102975 A102976`
	KEYWORD	`more,nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 17 2004`
	EXTENSIONS	`Addition of a(17) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 12 2010`

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

Last modified February 16 17:11 EST 2012. Contains 205938 sequences.