OFFSET
0,4
COMMENTS
This sequence does not always have prime exponents decreasing (i.e., is not always a product of primorial numbers). The first exception is a(5932), which is divisible by 7^1214, but only 5^1213.
FORMULA
a(n) = Product_{k=1}^n A000120(k).
MATHEMATICA
Join[{1}, FoldList[Times, Table[DigitCount[n, 2, 1], {n, 40}]]] (* Harvey P. Dale, Dec 08 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Franklin T. Adams-Watters, Aug 30 2006
STATUS
approved