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A066590
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3-EPRNs (Equal Product Of Reversible Numbers): numbers which can be expressed as the product of two reversible numbers in three different ways.
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0
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635040, 1015560, 1446480, 1854720, 4356000, 6350400, 10155600, 14464800, 18547200, 43560000, 51665040, 59552640, 63504000, 67944240, 76839840, 78127560, 82623060, 88560360, 95236960, 99497160, 101556000, 105094080
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 63540 = 1440 * 411 = 2520 * 252 = 4410 * 144.
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MATHEMATICA
| f[n_] := (m = ToExpression[StringReverse[ToString[n]]]; If[n > m, n*m, 0]); a = Sort[ Table[ f[n], {n, 0, 10^6}]]; While[ a[[1]] == 0, a = Drop[a, 1]]; a[[ Select[ Range[ Length[a]] - 2, a[[ # ]] == a[[ # + 2 ]] & ]]]
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CROSSREFS
| Cf. A066531.
Sequence in context: A172701 A048924 A183678 * A185476 A183745 A113951
Adjacent sequences: A066587 A066588 A066589 * A066591 A066592 A066593
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 08 2002
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