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#19
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Quote:
Forty-two is a pronic number and an abundant number; its prime factorization 2 · 3 · 7 makes it the second sphenic number and also the second of the form { 2 · 3 · r }. As with all sphenic numbers of this form, the aliquot sum is abundant by 12. 42 is also the second sphenic number to be bracketed by twin primes. 42 has a 14 member aliquot sequence 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0 and is itself part of the aliquot sequence commencing with the first sphenic number 30. Furthermore, 42 is the 10th member of the 3-aliquot tree. SO - Did I win?
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My Monster Progess Complete Set......: 238 / 520 : 45% HOF Cards..........: 009 / 076 : 12% Southern League.: 000 / 048 : 00% Minor League......: 055 / 086 : 41% Portrait Cards......: 077 / 180 : 43% Horizontal Cards.: 000 / 006 : 00% Last edited by toledo_mudhen; 09-23-2013 at 07:41 AM. |
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