A113916 - OEIS

This site is supported by donations to The OEIS Foundation.

A113916

Numbers n such that (p^n-1)/(p-1) is prime where p is the n-th prime.

3, 7, 19, 31, 307, 421 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Note that n must itself be a prime.`
	MATHEMATICA	`Do[ p = Prime[n]; If[PrimeQ[(p^n - 1)/(p - 1)], Print[n]], {n, 1800}] (* Robert G. Wilson v *)`
	CROSSREFS	`Sequence in context: A102271 A112633 A145039 * A049490 A112391 A127928` `Adjacent sequences: A113913 A113914 A113915 * A113917 A113918 A113919`
	KEYWORD	`nonn`
	AUTHOR	`Joao da Silva (zxawyh66(AT)yahoo.com), Jan 30 2006`

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

Last modified February 12 21:29 EST 2012. Contains 205433 sequences.