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A059915
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A sequence f(n) of positive integers is called an F-sequence (in memory of Fibonacci) if it satisfies f(0)=0, f(1)=1, f(2)=2 and for all n > 2, either f(n) = f(n-1) + f(n-2) or f(n) = f(n-1) + f(n-3). A positive integer is called an F-number if it occurs in any F-sequence. Sequence gives numbers which are not F-numbers.
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OFFSET
| 0,1
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COMMENTS
| The sequence given above contains all non-F-numbers up to 5000000 (according to Klaus Nagel (nagel.klaus(AT)t-online.de)).
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EXAMPLE
| 22 IS an F-number because 0,1,2,2,3,5,7,10,15,22,... is an F-sequence. All Fibonacci-numbers are F-numbers.
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CROSSREFS
| Sequence in context: A160221 A042024 A141999 * A059701 A036494 A185098
Adjacent sequences: A059912 A059913 A059914 * A059916 A059917 A059918
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KEYWORD
| hard,nonn
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AUTHOR
| Christian Wieschebrink (wieschebrink(AT)t-online.de), Feb 28 2001
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