id:A128938 - OEIS Search Results

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Numbers n such that n(n+1) plus the n-th prime is a prime.

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3, 5, 7, 9, 10, 11, 12, 13, 20, 27, 28, 32, 33, 35, 36, 41, 42, 43, 45, 47, 49, 54, 63, 65, 74, 75, 84, 91, 94, 95, 98, 104, 105, 107, 109, 113, 114, 117, 122, 124, 126, 128, 129, 135, 140, 149, 152, 155, 160, 164, 168, 171, 189, 190, 192, 199, 203, 209, 212, 214, 216 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`Given that 23 is the 9th prime, take 9*10 + 23 = 113, a prime.`
	MAPLE	`a:=proc(n) if isprime(n*(n+1)+ithprime(n))=true then n else fi end: seq(a(n), n=1..270); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 05 2007`
	CROSSREFS	`Sequence in context: A079377 A047747 A007957 this_sequence A093373 A096849 A080259` `Adjacent sequences: A128935 A128936 A128937 this_sequence A128939 A128940 A128941`
	KEYWORD	`nonn,less`
	AUTHOR	`J. M. Bergot (thekingfishb(AT)yahoo.ca), Apr 27 2007`
	EXTENSIONS	`Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), May 05 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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