OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
rad[n_] := Times @@ FactorInteger[n][[;; , 1]]; rad /@ (2 * Select[Range[250], PrimeQ] + 1) (* Amiram Eldar, Sep 07 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jun 11 2002
STATUS
approved