OFFSET
1,1
COMMENTS
All terms are even squares (A016742).
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A053143(2*n). - Michel Marcus, Aug 09 2013
MATHEMATICA
a[1] = 4; a[n_] := 2*n * Times @@ (First[#]^Mod[Last[#], 2] & /@ FactorInteger[2*n]); Array[a, 50] (* Amiram Eldar, Sep 05 2020 *)
PROG
(PARI) a(n) = 2*n * core(2*n); \\ Michel Marcus, Aug 09 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Reikku Kulon, Oct 02 2008
EXTENSIONS
Definition corrected by Michel Marcus, Aug 09 2013
STATUS
approved