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Search: id:A068077
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| A068077 |
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Numbers n such that sigma(n)+sigma(n+1)=4n. |
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+0
3
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OFFSET
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1,2
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MATHEMATICA
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For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==4n, Print[n]]]
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CROSSREFS
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Cf. A067806, A068078.
Adjacent sequences: A068074 A068075 A068076 this_sequence A068078 A068079 A068080
Sequence in context: A092682 A048526 A102332 this_sequence A094427 A050777 A050765
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KEYWORD
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more,nonn
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AUTHOR
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Dean Hickerson (dean(AT)math.ucdavis.edu), Feb 16 2002
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