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Search: id:A103160
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| A103160 |
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GCD of reversed(n!) and reversed((n+1)!). |
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+0
1
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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; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=GCD[A004153((n+1)!), A004153(n!)]
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EXAMPLE
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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
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rd[x_] :=FromDigits[Reverse[IntegerDigits[x]]] Table[GCD[rd[w! ], rd[(w+1)! ]], {w, 1, 100}]
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CROSSREFS
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Cf. A000142, A004153.
Sequence in context: A104861 A074859 A162682 this_sequence A126099 A063753 A066893
Adjacent sequences: A103157 A103158 A103159 this_sequence A103161 A103162 A103163
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KEYWORD
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base,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jan 25 2005
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