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2, 6, 12, 70, 102, 540, 1090, 1366, 1626, 4176, 9010, 9550
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Contribution from Farideh Firoozbakht (mymontain(AT)yahoo.com), Jun 14 2010: (Start)
If m is in the sequence then x=3^m is a solution for the equation
sigma(sigma(x))+sigma(x)=3x. Does this equation have other solutions? (End)
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CROSSREFS
| Sequence in context: A095921 A106037 A136240 * A076220 A178846 A173843
Adjacent sequences: A090744 A090745 A090746 * A090748 A090749 A090750
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KEYWORD
| nonn
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AUTHOR
| mohammed bouayoun (bouyao(AT)wanadoo.fr), Feb 03 2004
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