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A126665 a(n) = -n^2 + 9n + 53. 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; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

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

-1*8^2 + 9*8 + 53 = 61

CROSSREFS

Sequence in context: A180553 A079593 A086082 * A107160 A075587 A102635

Adjacent sequences:  A126662 A126663 A126664 * A126666 A126667 A126668

KEYWORD

sign

AUTHOR

Michael M. Ross (michaelmross(AT)comcast.net), Mar 13 2007

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Last modified February 14 08:06 EST 2012. Contains 205604 sequences.