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A129401
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Each composite number n in turn is factored, each prime factor is replaced by the next prime and then is remultiplied.
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0
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9, 15, 27, 25, 21, 45, 33, 35, 81, 75, 63, 55, 39, 135, 49, 51, 125, 99, 105, 243, 65, 57, 77, 225, 69, 85, 189, 165, 117, 175, 87, 405, 121, 147, 95, 153, 375, 91, 297, 115, 93, 315, 111, 275, 729, 119, 195, 171, 145, 231, 675, 123, 245, 207, 143, 255, 567, 625
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Each odd composite number appears in the sequence exactly once. - Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jun 05 2007
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FORMULA
| Equals A003961(n) where n runs through the composite numbers. - Jon Schoenfield, Jun 04 2007
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EXAMPLE
| a(19) = 105 because the factorization of the 19th composite number (i.e., 30) is 2*3*5 and replacing each prime factor with the next prime results in 3*5*7 which remultiplies to 105.
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CROSSREFS
| Cf. A002808, A003961.
Sequence in context: A014003 A082549 A013569 * A164385 A046353 A046356
Adjacent sequences: A129398 A129399 A129400 * A129402 A129403 A129404
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KEYWORD
| nonn
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AUTHOR
| Ben Thurston (benthurston27(AT)yahoo.com), May 28 2007
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EXTENSIONS
| More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jun 05 2007
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