OFFSET
1,1
COMMENTS
The sequence is infinite (see comment in A049532). - Emmanuel Vantieghem, Oct 25 2016
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = A049532(n)^2 + 1.
MATHEMATICA
Select[Range[400]^2+1, !SquareFreeQ[#]&] (* Harvey P. Dale, Sep 15 2016 *)
PROG
(Magma) [n^2+1: n in [1..500]| not IsSquarefree(n^2+1)]; // Vincenzo Librandi, Oct 26 2016
(PARI) is(n)=issquare(n-1) && !issquarefree(n) \\ Charles R Greathouse IV, Nov 05 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 08 2006
STATUS
approved