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Search: id:A140340
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| A140340 |
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A prime array is embedded in a binary quadratic equation that is a transform of 10x^2 -20x + 29. |
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+0
2
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| 29, 59, 109, 179, 269, 379, 509, 659, 829, 1019, 1229, 1459, 1709, 1979, 76, 86, 116
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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10a^2 + 19b^2, a = column 1:14, b = row 1:14, take all of the factors of row number b and remove them from all of the terms on the row, every number of the row will then be prime
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EXAMPLE
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a = 1, b = 10, S(1, 10) = 1910. 1910/2 = 955. 955/5 = 191 (a prime)
a =11, b = 11, S(11,11) = 3509. 3509/11 = 319. 3509/11 = 29 (a prime);
a = 7, b = 14, S(7,14) = 4214, 4214/2 = 2107, 2107/7 = 301, 301/7 = 43 {a prime)
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CROSSREFS
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Cf. A140754, A140755.
Adjacent sequences: A140337 A140338 A140339 this_sequence A140341 A140342 A140343
Sequence in context: A128469 A132236 A036062 this_sequence A140754 A047078 A042672
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KEYWORD
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nonn,uned,obsc,less
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AUTHOR
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Aldrich Stevens (aldrichstevens(AT)msn.com), May 29 2008
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EXTENSIONS
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Definition is not clear to me. How is this related to the very similar sequence A140754? - njas, Jun 04 2008
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