id:A093482 - OEIS Search Results

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a(n) = the least positive k such that (n+k)+1 and (n*k)+1 are both squares; or 0 if no such k exists.

+0
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0, 0, 5, 20, 3, 0, 0, 55, 215, 0, 13, 0, 11, 0, 209, 1139, 0, 0, 80, 4, 3, 0, 25, 551, 23, 0, 0, 1196, 0, 0, 8993, 0, 0, 0, 1189, 84, 0, 0, 41, 0, 39, 0, 0, 180, 1323, 0, 0, 2255, 30575, 0, 0, 0, 1315, 0, 8, 168, 0, 0, 61, 380, 59, 0, 80, 67535, 1615, 0, 0, 156, 371, 0 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`For n >1 if a(n) = m then a(m) = n. Subsidiary sequence: indices of zero.`
	EXAMPLE	`a(3) = 5, 3+5 +1 =9 and 3*5 +1 = 16 are both Squares.`
	CROSSREFS	`Cf. A093481.` `Sequence in context: A119964 A122152 A104314 this_sequence A030696 A098047 A101728` `Adjacent sequences: A093479 A093480 A093481 this_sequence A093483 A093484 A093485`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 14 2004`
	EXTENSIONS	`More terms from Don Reble (djr(AT)nk.ca), Oct 26 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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