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Search: id:A061899
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| A061899 |
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Fibonacci numbers that are not square-free. |
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+0
3
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| 8, 144, 2584, 46368, 75025, 832040, 14930352, 267914296, 4807526976, 12586269025, 86267571272, 225851433717, 1548008755920, 27777890035288, 498454011879264, 2111485077978050, 8944394323791464, 160500643816367088
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,87
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EXAMPLE
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144 and 2584 are Fibonacci numbers (A000045) and are not square-free: 144 = (2^4)(3^2), 2584 = (2^3)(17)(19).
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MATHEMATICA
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<< NumberTheory`NumberTheoryFunctions`; a={}; Do[f=Fibonacci[n]; If[ !SquareFreeQ[f], AppendTo[a, f]], {n, 1, 30}]; a (Vladimir Orlovsky, Jul 23 2008)
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PROGRAM
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(PARI) { n=0; h=g=1; for (i=0, 375, f=g + h; h=g; g=f; if (!issquarefree(f), write("b061899.txt", n++, " ", f)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 28 2009]
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CROSSREFS
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Cf. A000045, A061305.
Sequence in context: A090931 A112464 A065409 this_sequence A134492 A067421 A124059
Adjacent sequences: A061896 A061897 A061898 this_sequence A061900 A061901 A061902
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KEYWORD
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nonn,easy
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AUTHOR
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Asher Auel (asher.auel(AT)reed.edu), May 20 2001
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