A160230 - OEIS

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A160230

a(n) = A004760(n+1)-A160217(n), n>=1.

0, 0, 0, 3, 2, 0, 0, 6, 6, 4, 4, 3, 2, 0, 0, 15, 14, 12, 12, 11, 10, 8, 8, 6, 6, 4, 4, 3, 2, 0, 0, 30, 30, 28, 28, 27, 26, 24, 24, 22, 22, 20, 20, 19, 18, 16, 16, 15, 14, 12, 12, 11, 10, 8, 8, 6, 6, 4, 4, 3, 2, 0, 0, 63, 62, 60, 60, 59, 58, 56, 56, 54, 54, 52, 52, 51, 50

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..77.

FORMULA

a(1)=0; a(2n)=a(2n+1)=2a(n) if A007814(n) is even, a(2n)=a(2n+1)+1=2a(n)+3 if A007814(n) is odd.

EXAMPLE

a(2)=2a(1)=0; a(3)=2a(1)=0; a(4)=2a(2)+3=3; a(5)=2a(2)+2=2.

PROG

(PARI) is0(n)= (n<2) || binary(n)[2]; \\ A004760

list0(nn) = select(x->is0(x), vector(nn, k, k));