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A306569
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a(n) is the largest value obtained by iterating x -> noz(x * n) starting from 1 (where noz(k) = A004719(k) omits the zeros from k) if any, otherwise a(n) = -1.
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7
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1, 765257552, 4858337151, 62987487698944, 14281197489647865625, 16756687971893376, 956884714362661, 292452281337511936, 11897243269649199, 1, 824281567746336491, 13552472793415699584, 841944776182612378933, 9434962871842528764976
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Is every term positive?
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LINKS
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FORMULA
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a(10^k) = 1 for any k >= 0.
a(10*n) = a(n) for any n > 0.
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EXAMPLE
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PROG
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(PARI) See Links section.
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CROSSREFS
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See A306567 for the additive variant.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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