OFFSET
1,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
a(7) = 5 because A048784(7) / 2^5 = 32 / 32 = 1 is integer.
MAPLE
with(numtheory): for n from 1 to 100 do:ii:=0:for k from 500 by -1 to 1 while(ii=0) do: x:=evalf(tau(binomial(2*n, n))/2^k):if x=floor(x) then ii:=1: printf(`%d, `, k):else fi:od:od:
PROG
(PARI) a(n)=valuation(numdiv(binomial(2*n, n)), 2) \\ Charles R Greathouse IV, Jun 15 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Jun 15 2012
STATUS
approved