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Search: id:A137599
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| A137599 |
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Numbers n such that sigma(n)=reversal(n)-1. |
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+0
2
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OFFSET
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1,1
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COMMENT
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Next term is greater than 155*10^7.
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EXAMPLE
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sigma(75018277)=77281056=77281057-1=reversal(75018277)-1, so 75018277 is in the sequence.
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MATHEMATICA
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Do[If[DivisorSigma[1, n]==FromDigits@Reverse@IntegerDigits@n-1, Print[n]], {n, 1553000000}]
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CROSSREFS
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Cf. A137598.
Adjacent sequences: A137596 A137597 A137598 this_sequence A137600 A137601 A137602
Sequence in context: A106786 A088286 A034636 this_sequence A116236 A116259 A104921
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KEYWORD
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base,more,nonn,bref
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AUTHOR
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Farideh Firoozbakht (mymontain(AT)yahoo.com), Feb 23 2008
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