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Search: id:A139044
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| A139044 |
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Smallest prime divisor of the Fibonacci numbers > 1. |
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+0
3
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| 2, 3, 5, 2, 13, 3, 2, 5, 89, 2, 233, 13, 2, 3, 1597, 2, 37, 3, 2, 89, 28657, 2, 5, 233, 2, 3, 514229, 2, 557, 3, 2, 1597, 5, 2, 73, 37, 2, 3, 2789, 2, 433494437, 3, 2, 139, 2971215073, 2, 13, 5, 2, 3, 953, 2, 5, 3, 2, 59, 353, 2
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Fibonacci number > 1, divided by its largest proper divisor.
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FORMULA
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a(n) = A000045(n+2)/A032742(A000045(n+2)) = A000045(n+2)/A139045(n).
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MAPLE
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with(numtheory): with(combinat): a:=proc(n) options operator, arrow: op(2, divisors(fibonacci(n))) end proc: seq(a(n), n=3..60); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 02 2008
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MATHEMATICA
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First[First[FactorInteger[ # ]]]&/@Fibonacci[Range[3, 40]] - Harvey P. Dale (hpd1(AT)nyu.edu), Apr 30 2008
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CROSSREFS
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Cf. A000045, A032742, A133021, A139045.
Sequence in context: A137458 A079369 A102867 this_sequence A060383 A060442 A060385
Adjacent sequences: A139041 A139042 A139043 this_sequence A139045 A139046 A139047
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 23 2008
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu) and Harvey P. Dale (hpd1(AT)nyu.edu), May 02 2008
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