OFFSET
1,2
COMMENTS
All terms are 3-smooth (see A003586). The number of appearances of 2^a * 3^b is binomial(a+b,a). - Ivan Neretin, Jun 05 2016
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
FORMULA
MATHEMATICA
Fold[Join[#1, {2 #1[[#2]], 3 #1[[#2]]}] &, {1}, Range[33]] (* Ivan Neretin, Jun 05 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Aug 16 2002
STATUS
approved