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A090621 Highest power of 16 dividing n!. 1
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

LINKS

Table of n, a(n) for n=0..83.

FORMULA

a(n) =A090622(n, 16) =[A011371(n)/4] =[A090616(n)/2] =[([n/2]+[n/4]+[n/8]+[n/16]+...)/4]. Almost n/4.

EXAMPLE

a(10)=2 since 10!=3628800=16^2*14175

CROSSREFS

Cf. A011371, A054861, A090616, A027868, A054896, A090617, A090618, A090619, A090620.

Sequence in context: A120450 A127238 A072114 * A173711 A236678 A029378

Adjacent sequences:  A090618 A090619 A090620 * A090622 A090623 A090624

KEYWORD

nonn

AUTHOR

Henry Bottomley, Dec 06 2003

STATUS

approved

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Last modified November 19 00:12 EST 2018. Contains 317332 sequences. (Running on oeis4.)