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A069216
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Numbers n such that sigma(n) = reversal(n).
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6
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OFFSET
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1,2
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COMMENTS
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LINKS
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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}]
Select[Range[3000], DivisorSigma[1, #]==IntegerReverse[#]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 29 2017 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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