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A037864
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a(n)=(number of digits <=2)-(number of digits >2) in base 5 representation of n.
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1
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1, 1, -1, -1, 2, 2, 2, 0, 0, 2, 2, 2, 0, 0, 0, 0, 0, -2, -2, 0, 0, 0, -2, -2, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 3, 3, 3, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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LINKS
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Table of n, a(n) for n=0..81.
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MAPLE
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A037864 := proc(n)
a := 0 ;
dgs := convert(n, base, 5);
for i from 1 to nops(dgs) do
if op(i, dgs)<=2 then
a := a+1 ;
else
a := a-1 ;
end if;
end do:
a ;
end proc: # R. J. Mathar, Oct 16 2015
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MATHEMATICA
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nd5[n_]:=Module[{idn5=IntegerDigits[n, 5], a}, a=Count[idn5, _?(#<=2&)]; 2a-Length[idn5]]; Array[nd5, 90] (* Harvey P. Dale, Oct 13 2011 *)
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CROSSREFS
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Sequence in context: A004541 A178045 A321300 * A285635 A181674 A181676
Adjacent sequences: A037861 A037862 A037863 * A037865 A037866 A037867
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KEYWORD
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base,sign
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AUTHOR
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Clark Kimberling
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STATUS
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approved
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