A109132 - OEIS

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A109132

Numbers n such that n! + 1 is a Chen prime. n! + 1 is then called a factorial Chen prime.

0, 1, 2, 3, 11, 77 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	COMMENTS	`Conjecture: 77! + 1 is the largest factorial Chen prime.` `For n>2, n is in the sequence iff both numbers n!/3+1 and n!+1 are primes. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Mar 24 2006`
	CROSSREFS	`Cf. A002981, A109611.` `Sequence in context: A001052 A184310 A155187 * A008510 A042165 A089921` `Adjacent sequences: A109129 A109130 A109131 * A109133 A109134 A109135`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 17 2005`

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Last modified February 17 04:26 EST 2012. Contains 205978 sequences.