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URL: https://oeis.org/A037831

⇱ A037831 - OEIS

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A037831
Number of i such that d(i) >= d(i-1), where Sum_{i=0..m} d(i)*8^i is the base-8 representation of n.
9
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1
OFFSET
1,64
LINKS
MAPLE
A037831 := proc(n)
a := 0 ;
dgs := convert(n, base, 8);
for i from 2 to nops(dgs) do
if op(i, dgs)>=op(i-1, dgs) then
a := a+1 ;
end if;
end do:
a ;
end proc: # R. J. Mathar, Oct 16 2015
MATHEMATICA
A037831[n_] := Count[Differences[IntegerDigits[n, 8]], _?NonPositive];
Array[A037831, 100] (* Paolo Xausa, Jan 26 2026 *)
PROG
(MATLAB) n = 1:10000; a = arrayfun(@(m) sum(diff(dec2base(m, 8)-'0')<=0), n); % Chris R. Rehmann, Nov 12 2025
KEYWORD
nonn,base,easy
EXTENSIONS
Sign in Name corrected by R. J. Mathar, Oct 16 2015
STATUS
approved