OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..195
FORMULA
a(n) = A084920(n) * a(n-1) for n > 0.
a(n) = Product_{k=1..n} (prime(k)^2 - 1).
MATHEMATICA
a[n_]:=Product[Prime[k]^2-1, {k, 1, n}]; Join[{1}, Array[a, nmax]] (* Stefano Spezia, Sep 03 2018 *)
PROG
(PARI) {a(n) = prod(k=1, n, prime(k)^2-1)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 03 2018
STATUS
approved