OFFSET
1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..37
FORMULA
a(n) = Product_{k=1..n} prime(k)^(n-k+1) / 2.
MATHEMATICA
Table[Product[Prime[k]^(n - k + 1), {k, 1, n}]/2, {n, 1, 15}] (* G. C. Greubel, Oct 14 2018 *)
PROG
(PARI) for(n=1, 15, print1(prod(k=1, n, prime(k)^(n-k+1))/2, ", ")) \\ G. C. Greubel, Oct 14 2018
(Magma) [(&*[NthPrime(k)^(n-k+1): k in [1..n]])/2: n in [1..15]]; // G. C. Greubel, Oct 14 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
STATUS
approved