id:A087031 - OEIS Search Results

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Numbers n such that 2p-n is prime, p is the smallest prime > n.

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1, 3, 9, 15, 27, 31, 39, 33, 31, 39, 47, 57, 61, 69, 63, 61, 69, 75, 91, 99, 93, 91, 99, 105, 115, 135, 117, 123, 115, 135, 141, 147, 151, 159, 167, 177, 183, 195, 185, 189, 183, 195, 199, 213, 217, 225, 219, 217, 225, 237, 245, 251, 257, 267, 271, 279, 273, 271 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)=2p-n, p is the smallest prime > n`
	EXAMPLE	`3 is a term because smallest prime >3 is 5 and 2*5-3=7 is prime.`
	CROSSREFS	`Cf. A087030.` `Sequence in context: A085046 A138495 A055927 this_sequence A089632 A082897 A147516` `Adjacent sequences: A087028 A087029 A087030 this_sequence A087032 A087033 A087034`
	KEYWORD	`easy,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jul 31 2003`

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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.

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