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A255873
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The first nonzero digit of n/7.
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1
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1, 2, 4, 5, 7, 8, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
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OFFSET
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1,2
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LINKS
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EXAMPLE
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The leading (most significant) digit of 22/7 in A068028 is 3, so a(22)=3.
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MAPLE
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local nshf ;
nshf := n/7 ;
while nshf < 1 do
nshf := 10*nshf;
end do;
while nshf >= 10 do
nshf := nshf/10;
end do;
floor(nshf) ;
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MATHEMATICA
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f[n_] := RealDigits[n/7, 10, 9][[1, 1]]; Array[f, 105] (* Robert G. Wilson v, Mar 08 2015 *)
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PROG
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(PARI) a(n) = {my(x = n/7.0); if (x < 1, x *= 10); while (x >= 10, x /= 10); floor(x); } \\ Michel Marcus, Mar 12 2015
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CROSSREFS
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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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