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A139586
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Non-Fibonacci numbers with Fibonacci number of divisors.
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1
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4, 7, 9, 11, 16, 17, 19, 23, 24, 25, 29, 30, 31, 37, 40, 41, 42, 43, 47, 49, 53, 54, 56, 59, 61, 66, 67, 70, 71, 73, 78, 79, 81, 83, 88, 97, 101, 102, 103, 104, 105, 107, 109, 110, 113, 114, 121, 127, 128, 130, 131, 135, 136, 137, 138
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| A000005(a(n)) is a Fibonacci number.
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EXAMPLE
| 16 belongs to the sequence because is not a Fibonacci number and its number of divisors is 5, a Fibonacci number.
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MATHEMATICA
| fibs=Fibonacci[Range[15]]; nonfibs=Complement[Range[fibs[[-1]]], fibs]; Select[nonfibs, MemberQ[fibs, DivisorSigma[0, #]]&] [From Harvey P. Dale, Jan. 11, 2011]
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CROSSREFS
| Non-Fibonacci number: A001690. Cf. A000005, A000045, A139095, A139587, A139588, A139589, A139590.
Sequence in context: A035245 A109180 A025054 * A074341 A085922 A048973
Adjacent sequences: A139583 A139584 A139585 * A139587 A139588 A139589
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 22 2008
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