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Search: id:A135955
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| A135955 |
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(Nonprime Fibonnaci numbers with prime indices, A050937) which have exactly 4 prime factors. |
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+0
8
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| 83621143489848422977, 6161314747715278029583501626149, 289450641941273985495088042104137, 5193981023518027157495786850488117, 66233869353085486281758142155705206899077
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Conjecture: All numbers in this sequence are products of four sums of two squares.
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MATHEMATICA
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k = {}; Do[If[ !PrimeQ[Fibonacci[Prime[n]]], c = Length[FactorInteger[Fibonacci[Prime[n]]]]; If[c == 4, AppendTo[k, Fibonacci[Prime[n]]]]], {n, 1, 50}]; k
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CROSSREFS
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Cf. A000045, A001605, A050937, A075737, A090819, A134787, A134851, A134852, A135953, A135954, A135956, A135957.
Sequence in context: A104283 A003852 A003845 this_sequence A104840 A095436 A046061
Adjacent sequences: A135952 A135953 A135954 this_sequence A135956 A135957 A135958
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Dec 08 2007
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