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A306155
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a(n) > a(n-1) is the smallest number such that a(n)! contains a(n-1)! as a substring, with a(0) = 0.
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0
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OFFSET
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0,3
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LINKS
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EXAMPLE
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a(2)=5 and 5! = 120 is a substring of 14! = 8717829(120)0. Therefore, a(3) is 14.
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MATHEMATICA
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a[0]=0;
a[n_]:=Module[{k=a[n-1]+1}, While[StringPosition[ToString[k!], ToString[a[n-1]!]]=={}, k++]; k];
a/@Range[0, 3]
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CROSSREFS
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KEYWORD
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nonn,base,more,bref
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AUTHOR
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STATUS
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approved
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