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A230404 a(n) = the largest k such that (k+1)! divides 2n; the number of trailing zeros in the factorial base representation of even numbers. 3
1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 4, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 3, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10080

FORMULA

a(n) = A230403(2n) = A055881(2n)-1.

PROG

(Scheme)

(define (A230404 n) (A230403 (* 2 n)))

CROSSREFS

Used to compute A230405 and A219650. See A007623 for factorial base representation.

Analogous sequence for binary system: A001511.

Sequence in context: A161072 A161111 A161046 * A082647 A214018 A304869

Adjacent sequences:  A230401 A230402 A230403 * A230405 A230406 A230407

KEYWORD

nonn,easy

AUTHOR

Antti Karttunen, Oct 31 2013

STATUS

approved

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Last modified November 13 02:28 EST 2018. Contains 317120 sequences. (Running on oeis4.)