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A115043
a(0)=3, a(1)=5. a(n) = a(n-1)*a(n-2) if n odd, else a(n) = a(n-1)/a(n-2).
1
3, 5, 15, 3, 45, 15, 675, 45, 30375, 675, 20503125, 30375, 622782421875, 20503125, 12768985843505859375, 622782421875, 7952299928506168842315673828125, 12768985843505859375
OFFSET
0,1
COMMENTS
All divisors >1 of the terms are also in the sequence.
FORMULA
a(n) = a(n-2)*a(n-4) if n odd. a(n)=a(n-3) if n even.
a(2n+1) = 3^Fibonacci(n+1) * 5^Fibonacci(n).
a(2n) = 3^Fibonacci(n-1) * 5^Fibonacci(n-2).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Feb 28 2006
EXTENSIONS
Formulas corrected by R. J. Mathar, Mar 16 2010
STATUS
approved