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A066598 Numbers which can be expressed as the product of a number and its reversal in four different ways. 2
1015560, 1446480, 1854720, 10155600, 14464800, 18547200, 51665040, 59552640, 67944240, 78127560, 82623060, 88560360, 95236960, 99497160, 101556000, 105094080, 108656860, 110937960, 117681480, 118072080, 124942090, 135647680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

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]] - 3, a[[ # ]] == a[[ # + 3 ]] & ]]]

CROSSREFS

Cf. A066531.

Sequence in context: A210274 A252916 A340435 * A212940 A232144 A293127

Adjacent sequences:  A066595 A066596 A066597 * A066599 A066600 A066601

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jan 08 2002

STATUS

approved

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Last modified May 24 04:43 EDT 2022. Contains 354005 sequences. (Running on oeis4.)