OFFSET
0,2
COMMENTS
Central terms of triangle A098012. - Reinhard Zumkeller, Oct 02 2014
For n >= 0, a(n+1) is the n-th power of 15 in the monoid defined by A306697. - Peter Munn, Feb 18 2020
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 0..250
FORMULA
EXAMPLE
a(1)=2; a(2) = 3*5 = 15; a(3) = 5*7*11 = 385.
MAPLE
seq(mul(ithprime(n+k), k=0..n-1), n=0..15); # Muniru A Asiru, Mar 16 2019
MATHEMATICA
Table[Times@@Prime[Range[n, 2n-1]], {n, 20}] (* Harvey P. Dale, Jul 19 2018 *)
PROG
(Haskell)
a060381 n = a098012 (2 * n - 1) n -- Reinhard Zumkeller, Oct 02 2014
(GAP) P:=Filtered([1..200], IsPrime);;
a:=List([1..15], n->Product([0..n-1], k->P[n+k])); # Muniru A Asiru, Mar 16 2019
(PARI) a(n) = prod(k=n, 2*n-1, prime(k)); \\ Michel Marcus, Mar 16 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jason Earls, Apr 03 2001
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Mar 16 2019
STATUS
approved