id:A109805 - OEIS Search Results

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a(n) = prime(n+2)*prime(n+1) - prime(n)*prime(n+1).

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9, 20, 42, 66, 78, 102, 114, 230, 232, 248, 370, 246, 258, 470, 636, 472, 488, 670, 426, 584, 790, 830, 1246, 1164, 606, 618, 642, 654, 2034, 2286, 1310, 1096, 1668, 1788, 1208, 1884, 1630, 1670, 2076, 1432, 2172, 2292, 1158, 1182, 2786, 5064, 3568, 1362 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`9 is the only semiprime of the form prime(n+2)prime(n+1) - prime(n)prime(n+1).`
	MATHEMATICA	`Table[Prime[n + 1](Prime[n + 2] - Prime[n]), {n, 48}] (Chandler*)`
	CROSSREFS	`The largest prime factor of a(n) gives the sequence A000040.` `Sequence in context: A059108 A028566 A128153 this_sequence A013573 A013338 A008847` `Adjacent sequences: A109802 A109803 A109804 this_sequence A109806 A109807 A109808`
	KEYWORD	`easy,nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Aug 16 2005`
	EXTENSIONS	`Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 17 2005`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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