OFFSET
2,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 2..107
EXAMPLE
A007781(14) = 10809131718965763 = 3 * 61^2 * 968299894201, therefore a(14) = 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 11 2002
EXTENSIONS
a(20)-a(40) from Daniel Starodubtsev, Mar 10 2019
a(41)-a(45) from Chai Wah Wu, Jul 15 2019
STATUS
approved