OFFSET
1,3
COMMENTS
a(n) is squarefree, and all squarefree numbers appear infinitely often. a(m) = a(n) if and only if rad(m) = rad(n), where rad is A007947. - Charles R Greathouse IV, Apr 09 2024
Rad(n*a(n)) = A002110(A000720(A006530(n))) is the smallest primorial number divisible by rad(n). - David James Sycamore, May 15 2024
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..2376
FORMULA
MATHEMATICA
Array[Times @@ Complement[Prime@ Range@ PrimePi@ Last[#], #] &[FactorInteger[#][[All, 1]]] &, 46] (* Michael De Vlieger, Apr 09 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Reinhard Zumkeller, May 04 2003
EXTENSIONS
Edited by Peter Munn, Apr 09 2024
STATUS
approved