OFFSET
0,2
COMMENTS
The prime factors are A290043.
FORMULA
a(n) = Product_{k=n(n-1)/2 + 1..n(n+1)/2} A290043(k) for n > 0.
EXAMPLE
a(1) = nextprime(1) = 2;
a(2) = nextprime(2)*nextprime(nextprime(2)) = 3*5 = 15;
a(3) = nextprime(15)*nextprime(nextprime(15))*nextprime(nextprime(nextprime(15))) = 17*19*23 = 7429.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Sondow, Aug 20 2017
STATUS
approved