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Search: id:A067806
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| A067806 |
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Numbers n such that sigma(n+1)+sigma(n)=3n. |
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+0
3
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| 10, 34, 136, 169, 2402, 5329, 21004, 41164, 54722, 1060802, 5026562, 10800112, 11108164, 14366402, 87026656, 102944992, 10499710072
(list; graph; listen)
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OFFSET
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1,1
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MATHEMATICA
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For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==3n, Print[n]]]
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CROSSREFS
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Cf. A068077, A068078.
Sequence in context: A119227 A166066 A068078 this_sequence A001446 A001890 A010818
Adjacent sequences: A067803 A067804 A067805 this_sequence A067807 A067808 A067809
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KEYWORD
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more,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 07 2002
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EXTENSIONS
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Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Feb 16 2002
a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 31 2009
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