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A226590 Total number of 0's in binary expansion of all divisors of n. 3
0, 1, 0, 3, 1, 2, 0, 6, 2, 4, 1, 6, 1, 2, 1, 10, 3, 7, 2, 9, 2, 4, 1, 12, 3, 4, 3, 6, 1, 6, 0, 15, 5, 8, 4, 15, 3, 6, 3, 16, 3, 8, 2, 9, 5, 4, 1, 20, 3, 9, 5, 9, 2, 10, 3, 12, 4, 4, 1, 15, 1, 2, 4, 21, 7, 14, 4, 15, 5, 12, 3, 26, 4, 8, 6, 12, 4, 10, 2, 25, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Also total number of 0's in binary expansion of concatenation of the binary numbers that are the divisors of n written in base 2 (A182621).

LINKS

Jaroslav Krizek, Table of n, a(n) for n = 1..500

FORMULA

a(n) = A182627(n) - A093653(n).

EXAMPLE

a(8) = 6 because the divisors of 8 are [1, 2, 4, 8] and in binary: 1, 10, 100, 1000, so six 0's.

MATHEMATICA

Table[Count[Flatten[IntegerDigits[Divisors[n], 2]], 0], {n, 81}] (* T. D. Noe, Sep 04 2013 *)

CROSSREFS

Cf. A093653 (number of 1's in binary expansion of all divisors of n).

Cf. A182627 (number of digits in binary expansion of all divisors of n).

Cf. A182621 (concatenation of the divisors of n written in base 2).

Sequence in context: A318526 A054869 A201671 * A261349 A227962 A331105

Adjacent sequences:  A226587 A226588 A226589 * A226591 A226592 A226593

KEYWORD

base,nonn

AUTHOR

Jaroslav Krizek, Aug 31 2013

STATUS

approved

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Last modified January 25 01:46 EST 2020. Contains 331229 sequences. (Running on oeis4.)