Search: id:A129401
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%I A129401
%S A129401 9,15,27,25,21,45,33,35,81,75,63,55,39,135,49,51,125,99,105,243,65,57,
%T A129401 77,225,69,85,189,165,117,175,87,405,121,147,95,153,375,91,297,115,93,
%U A129401 315,111,275,729,119,195,171,145,231,675,123,245,207,143,255,567,625
%N A129401 Each composite number n in turn is factored, each prime factor is replaced 
               by the next prime and then is remultiplied.
%C A129401 Each odd composite number appears in the sequence exactly once. - Jon 
               E. Schoenfield (jonscho(AT)hiwaay.net), Jun 05 2007
%F A129401 Equals A003961(n) where n runs through the composite numbers. - Jon Schoenfield, 
               Jun 04 2007
%e A129401 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.
%Y A129401 Cf. A002808, A003961.
%Y A129401 Sequence in context: A014003 A082549 A013569 this_sequence A164385 A046353 
               A046356
%Y A129401 Adjacent sequences: A129398 A129399 A129400 this_sequence A129402 A129403 
               A129404
%K A129401 nonn
%O A129401 1,1
%A A129401 Ben Thurston (benthurston27(AT)yahoo.com), May 28 2007
%E A129401 More terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), Jun 05 2007

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