id:A126665 - OEIS Search Results

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a(n) = -n^2 + 9n + 53.

+0
5

53, 61, 67, 71, 73, 73, 71, 67, 61, 53, 43, 31, 17, 1, -17, -37, -59, -83, -109, -137, -167, -199, -233, -269, -307, -347, -389, -433, -479, -527, -577, -629, -683, -739, -797, -857, -919, -983, -1049, -1117, -1187, -1259, -1333, -1409, -1487, -1567, -1649, -1733, -1819, -1907, -1997, -2089, -2183, -2279 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Quadratic equation derived from the four primes 61, 67, 71, 73 using the method of common differences. Many of the initial terms are primes.`
	LINKS	`Michael M. Ross, Natural Numbers` `Robert Sacks Number Spiral: Method of Common Differences.`
	EXAMPLE	`-18^2 + 98 + 53 = 61`
	CROSSREFS	`Sequence in context: A079593 A045711 A086082 this_sequence A107160 A075587 A102635` `Adjacent sequences: A126662 A126663 A126664 this_sequence A126666 A126667 A126668`
	KEYWORD	`sign`
	AUTHOR	`Michael M. Ross (michaelmross(AT)comcast.net), Mar 13 2007`

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Last modified March 19 13:18 EDT 2010. Contains 173632 sequences.

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