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Search: id:A066245
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| A066245 |
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Floor(|x sin(x)|)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218. |
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+0
1
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OFFSET
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1,1
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LINKS
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J. Pe, On a Generalization of Perfect Numbers, J. Rec. Math., 31(3) (2002-2003), 168-172.
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EXAMPLE
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Let f(n) = floor(|x sin(x)|). Then f(6) = 1 = 0+1+0 = f(3)+f(2)+f(1); so 6 is a term of the sequence.
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MATHEMATICA
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f[x_] := Floor[Abs[x*Sin[x]]]; Select[ Range[2, 10^4], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ]
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CROSSREFS
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Sequence in context: A001465 A094276 A151376 this_sequence A068821 A062100 A048089
Adjacent sequences: A066242 A066243 A066244 this_sequence A066246 A066247 A066248
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KEYWORD
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nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 19 2001
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