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Search: id:A069216
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| A069216 |
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Numbers n such that sigma(n) = reversal(n). |
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+0
6
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OFFSET
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1,2
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COMMENT
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There is no further term up to 10^10. - Farideh Firoozbakht (mymontain(AT)yahoo.com), Jan 20 2008
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EXAMPLE
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sigma(2556) = 6552 = reversal(2556), so 2556 belongs to the sequence.
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MATHEMATICA
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Do[If[DivisorSigma[1, n] == FromDigits[Reverse[IntegerDigits[n]]], Print[n]], {n, 1, 10^5}]
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CROSSREFS
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Sequence in context: A009434 A115920 A158732 this_sequence A158736 A161486 A113707
Adjacent sequences: A069213 A069214 A069215 this_sequence A069217 A069218 A069219
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Apr 11 2002
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