A063685 - OEIS

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A063685

Numbers n such that !n + phi(n)-1 is prime.

2, 3, 4, 5, 11, 20, 85, 212 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..8.`
	PROG	`(PARI) f(n) = sum(k=0, n-1, k!); for(n=1, 10^6, if(isprime(f(n)+eulerphi(n)-1), print(n)))`
	CROSSREFS	`Cf. A003422.` `Sequence in context: A118968 A073528 A116067 * A006481 A118597 A083160` `Adjacent sequences: A063682 A063683 A063684 * A063686 A063687 A063688`
	KEYWORD	`more,nonn`
	AUTHOR	`Jason Earls (zevi_35711(AT)yahoo.com), Aug 22 2001`
	STATUS	`approved`

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Last modified June 17 23:56 EDT 2013. Contains 226327 sequences.