A056966 - OEIS

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A056966

In binary: write what is described (putting a leading zero on numbers which have an odd number of binary digits).

0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 2, 2, 4, 5, 3, 3, 6, 7, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 2, 3, 0, 0, 0, 1, 0, 0, 0, 1, 0

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

OFFSET

0,15

LINKS

Table of n, a(n) for n=0..104.

EXAMPLE

a(54)=2 because 54 = 110110 base 2, which can be read as one 1 followed by zero 1's followed by one 0, i.e., 10 base 2 = 2 base 10.

PROG

(Python)

def A056966(n):

s = bin(n)[2:]

s = '0'*(len(s)&1)+s