OFFSET
1,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
s = {}; m = 12; Do[n = 5^k; While[n <= 5^m, AppendTo[s, n]; n *= 3], {k, 0, m}]; Map[GCD @@ # &, Partition[Union[s], 2, 1]] (* Amiram Eldar, Feb 06 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 18 2005
STATUS
approved