OFFSET
1,2
COMMENTS
Arises in analysis of "when to clean your room".
LINKS
Kimball Martin and Krishnan Shankar, How often should you clean your room?, arXiv:1305.1984 [math.CO], 2013-2014.
FORMULA
EXAMPLE
a(3) = floor(4*log_2(3)) = floor(6.33985000) = 6.
a(8) = floor(4*log_2(8)) = floor(4*3) = 12.
MAPLE
MATHEMATICA
Table[Floor[4*Log[2, n]], {n, 1, 64}] (* Jean-François Alcover, Nov 30 2017 *)
PROG
(PARI) a(n) = 4*log(n)\log(2); \\ Michel Marcus, Nov 30 2017
(PARI) apply( A225668(n)=exponent(n^4), [1..99]) \\ M. F. Hasler, Nov 07 2019
CROSSREFS
KEYWORD
nonn,easy,changed
AUTHOR
Jonathan Vos Post, May 11 2013
EXTENSIONS
Better definition from M. F. Hasler, Nov 07 2019
STATUS
approved