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Search: id:A063487
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| 0, 1, 2, 3, 4, 5, 7, 9, 11, 13, 16, 20, 25
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OFFSET
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0,3
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COMMENT
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2^(2^n)-1 is the product of the first n Fermat numbers F(0),...,F(n-1) (A000215). Hence this sequence is just the summation of A046052, which gives the number of prime factors in each Fermat number. - T. D. Noe (noe(AT)sspectra.com), Jan 07 2003
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REFERENCES
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D. M. Burton, Elementary Number Theory, Allyn and Bacon Inc., Boston MA, 1976, p. 238.
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LINKS
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Eric Weisstein's World of Mathematics, Fermat Number
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PROGRAM
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(PARI) for(n=0, 22, print(omega(2^(2^n)-1)))
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CROSSREFS
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Cf. A051179, A000215, A046052.
Sequence in context: A050198 A008740 A089651 this_sequence A081998 A074583 A001092
Adjacent sequences: A063484 A063485 A063486 this_sequence A063488 A063489 A063490
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 28 2001
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EXTENSIONS
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More terms from T. D. Noe (noe(AT)sspectra.com), Jan 07 2003
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