OFFSET
0,2
COMMENTS
The terms a(0) .. a(5), when viewed in primorial base (A049345) look as: 1, 20, 300, 5000, 70000, E00000, where "E" stands for the digit eleven.
LINKS
FORMULA
MATHEMATICA
Table[If[n==0, 1, Prime[n] Product[Prime[k], {k, n}]], {n, 0, 100}] (* Indranil Ghosh, Jul 07 2017 *)
PROG
(Python)
from sympy import prime, primorial
def a002110(n): return 1 if n<1 else primorial(n)
def a(n): return 1 if n==0 else prime(n)*a002110(n)
print([a(n) for n in range(41)]) # Indranil Ghosh, Jul 07 2017
(PARI) a(n) = if (n==0, 1, prime(n)*prod(k=1, n, prime(k))); \\ Michel Marcus, Jul 07 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 07 2017
STATUS
approved