OFFSET
0,5
LINKS
Enrique PĂ©rez Herrero, Table of n, a(n) for n = 0..3000
EXAMPLE
a(5) = 3, as C(5) = 42 factors as 2*3*7 (3 distinct prime factors).
MATHEMATICA
PrimeNu[CatalanNumber[Range[0, 80]]] (* Harvey P. Dale, Mar 27 2013 *)
PROG
(PARI) C(n)=binomial(2*n, n)/(n+1);
for(n=1, 100, print1(matsize(factor(C(n-1)))[1], ", ")); \\ Joerg Arndt, Apr 19 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Mar 19 2003
STATUS
approved