id:A078444 - OEIS Search Results

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Integer part of geometrical average of consecutive primes.

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2, 3, 5, 8, 11, 14, 17, 20, 25, 29, 33, 38, 41, 44, 49, 55, 59, 63, 68, 71, 75, 80, 85, 92, 98, 101, 104, 107, 110, 119, 128, 133, 137, 143, 149, 153, 159, 164, 169, 175, 179, 185, 191, 194, 197, 204, 216, 224, 227, 230, 235, 239, 245, 253, 259, 265, 269, 273, 278 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`For n > 1, a(n) = prime(n) iff prime(n) and prime(n+1) are twins`
	FORMULA	`a(n) = floor(sqrt(prime(n)*prime(n+1)))`
	EXAMPLE	`a(7) = floor(sqrt(prime(7)*prime(8))) = 17`
	CROSSREFS	`Sequence in context: A117725 A106637 A071894 this_sequence A054925 A126097 A131073` `Adjacent sequences: A078441 A078442 A078443 this_sequence A078445 A078446 A078447`
	KEYWORD	`nonn`
	AUTHOR	`Lior Manor (lior.manor(AT)gmail.com) Dec 31 2002`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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