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Search: id:A071678
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| A071678 |
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GCD of n! and the reverse of n!. |
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+0
1
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| 1, 2, 6, 6, 3, 9, 45, 1152, 189, 189, 99, 594, 594, 198, 99, 198, 99, 594, 99, 378378, 45045, 99, 396, 30294, 2279277, 14256, 3267, 1089, 6336, 9702, 20196, 6534, 396, 11088, 20117097, 99, 99, 6318675, 594, 21978, 1089, 297, 2178, 594, 1683, 1485
(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)=A055483[n! ]
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EXAMPLE
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n=7, a(7)=GCD[5040,405]=45.
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MATHEMATICA
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nd[x_, y_] := 10*x+y tn[x_] := Fold[nd, 0, x] ed[x_] := IntegerDigits[x] red[x_] := Reverse[IntegerDigits[x]] Table[GCD[w!, tn[red[w! ]]], {w, 1, 128}]
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CROSSREFS
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Cf. A055483.
Sequence in context: A136696 A086358 A004152 this_sequence A141329 A110388 A007507
Adjacent sequences: A071675 A071676 A071677 this_sequence A071679 A071680 A071681
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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), May 31 2002
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