A038767 - OEIS

This site is supported by donations to The OEIS Foundation.

A038767

Numbers n for which n-th primorial + square of (n+1)-th prime is also a prime.

1, 2, 3, 4, 6, 13, 19, 28, 41, 66, 85 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`r=Prime[n+1^2 is the smallest possible composite number, if added to the n-th primorial might give a prime`
	FORMULA	`a(n)=A002110(n)+Prime[n+1]^2 is prime; n so that A054758(n)=1`
	EXAMPLE	`a(5)=6, 6-th primorial is 30030, square of 7th prime is 289, sum gives 30319, a prime. No more were found below 200.`
	CROSSREFS	`A002110, A054758.` `Sequence in context: A096988 A066463 A073146 * A188715 A174046 A095991` `Adjacent sequences: A038764 A038765 A038766 * A038768 A038769 A038770`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 04 2000`

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

Last modified February 16 10:07 EST 2012. Contains 205904 sequences.