OFFSET
1,1
LINKS
R. G. Wilson, V, Note, n.d.
FORMULA
a(n) is of the form 2^b*3^c*5^d where either b+c+d=1, or where each of b, c and d are positive and the largest of the three is an odd number less than the sum of the other two. For n>3: a(n) is 30 times a power of 6 times a power of 10 times a power of 15.
EXAMPLE
a(15) = 10800 = 2*30*180 = a(1)*a(4)*a(5).
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Mar 28 2001
STATUS
approved