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A067806
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Numbers n such that sigma(n+1)+sigma(n)=3n.
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2
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10, 34, 136, 169, 2402, 5329, 21004, 41164, 54722, 1060802, 5026562, 10800112, 11108164, 14366402, 87026656, 102944992, 10499710072
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| For[n=1, True, n++, If[DivisorSigma[1, n]+DivisorSigma[1, n+1]==3n, Print[n]]]
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CROSSREFS
| Cf. A068077, A068078.
Sequence in context: A119227 A166066 A068078 * A001446 A001890 A010818
Adjacent sequences: A067803 A067804 A067805 * A067807 A067808 A067809
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KEYWORD
| more,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 07 2002
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EXTENSIONS
| 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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