A037810 Number of i such that d(i) <= d(i-1), where Sum_{i=0..m} d(i)*3^i is the base-3 representation of n.

0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 1, 1, 1, 0, 1, 1, 1, 1, 2, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 2, 3, 3, 2, 2, 3, 2, 2, 2, 1, 2, 2, 2, 2, 3, 2, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 3, 3, 3, 3, 2, 3, 3, 2, 2, 3, 2

Offset

1,13

Links

Table of n, a(n) for n=1..90.

Maple

A037810 := proc(n)
    a := 0 ;
    dgs := convert(n, base, 3);
    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

Crossrefs

Cf. A037826.

Sequence in context: A362423 A274274 A072550 * A335211 A038769 A327818

Adjacent sequences: A037807 A037808 A037809 * A037811 A037812 A037813

Keyword

nonn,base

Author

Clark Kimberling

Extensions

Sign in name corrected by R. J. Mathar, Oct 16 2015

Status

approved