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A103160
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GCD of reversed(n!) and reversed((n+1)!).
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0
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1, 2, 6, 21, 3, 27, 9, 9, 88263, 9, 99, 594, 198, 99, 99, 99, 99, 99, 99, 9009, 99, 99, 198, 99, 99, 297, 1089, 99, 198, 198, 594, 198, 396, 693, 99, 99, 99, 297, 594, 99, 99, 99, 198, 99, 99, 99, 99, 99, 99, 99, 99, 396, 2772, 99, 99, 99, 396, 693, 693, 99, 99, 99, 99
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n)=GCD[A004153((n+1)!), A004153(n!)]
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EXAMPLE
| Outstandingly high values arise at n=10^k-1 because
A004153(n)=A004153(n+1), a(n)=rev[n! ], n!-backward-written.
See n=9,99,999, etc..
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MATHEMATICA
| rd[x_] :=FromDigits[Reverse[IntegerDigits[x]]] Table[GCD[rd[w! ], rd[(w+1)! ]], {w, 1, 100}]
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CROSSREFS
| Cf. A000142, A004153.
Sequence in context: A104861 A074859 A162682 * A126099 A063753 A066893
Adjacent sequences: A103157 A103158 A103159 * A103161 A103162 A103163
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KEYWORD
| base,nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jan 25 2005
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