A091821 - OEIS

A091821

a(n) counts the one-bits in the binary representation of n when we cycle from left to right through the individual bits of n, restarting at the leftmost bit after the rightmost is reached and performing n bitwise steps in total.

1, 1, 3, 2, 3, 4, 7, 2, 5, 5, 8, 6, 10, 11, 15, 4, 7, 7, 11, 8, 13, 13, 18, 10, 15, 16, 22, 18, 23, 24, 31, 6, 11, 11, 17, 12, 19, 19, 25, 14, 20, 21, 29, 22, 30, 31, 39, 16, 25, 26, 34, 27, 35, 36, 46, 29, 39, 39, 49, 40, 51, 52, 63, 10

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

OFFSET

1,3

COMMENTS

This might be called the bcrrpsod or binary cyclic right rotating progressive sum of digits function.

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

a(9) = 5 because 9 = 1001 in binary and cycling from left to right through 9 steps all the bits of 1001 are visited twice but the first bit, which is visited three times. Counting all visited one-bits evaluates to 5.

CROSSREFS

Sequence in context: A211947 A220071 A132408 * A086035 A334449 A268289

Adjacent sequences: A091818 A091819 A091820 * A091822 A091823 A091824

KEYWORD

easy,nonn

AUTHOR

Frank Schwellinger (nummer_eins(AT)web.de), Mar 08 2004

STATUS

approved