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A111185
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Let f(n) denote the largest prime factor of n which is not a palindrome. Sequence gives numbers n such that the sum of the factorials of the digits of n is equal to f(n) reversed.
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1
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143, 541, 2105, 2444, 3431, 4144, 4233, 4301, 4440, 10234, 12243, 12341, 20313, 22320, 30422, 34030, 34144, 35140, 46003, 52100, 53013, 102613, 106312, 112413, 113162, 120032, 134046, 200340, 202124, 203112, 210304, 211203, 211232, 212004
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 2105 = 5.'421' and 2!+1!+0!+5! = 124.
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MATHEMATICA
| r[n_] := FromDigits[Reverse[IntegerDigits[n]]]; np[n_] := (n != r[n]); f[n_] := Plus @@ Map[ #!&, IntegerDigits[n]]; Do[l = Select[First /@ FactorInteger[n], np]; If[Length[l] > 0, k = r[Max[l]]; If[k == f[n], Print[n]]], {n, 1, 10^6}] (Propper)
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CROSSREFS
| See A074301 for another version.
Sequence in context: A003902 A156963 A126703 * A074301 A156635 A035304
Adjacent sequences: A111182 A111183 A111184 * A111186 A111187 A111188
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KEYWORD
| base,nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Sep 21 2002
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Oct 19 2005
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