OFFSET
1,2
COMMENTS
Conjecture: sequence is A071253 minus those entries of A071253 that have their index in A049532, i.e., a(n) is of form n^2*(n^2+1) for all n not in A049532. - Ralf Stephan, Aug 18 2004
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..300
MATHEMATICA
core[n_] := Times @@ Apply[ Power, {#[[1]], Mod[#[[2]], 2]}& /@ FactorInteger[n], {1}]; Select[Range[500000], core[#] == Ceiling[Sqrt[#]]&] (* Jean-François Alcover, Jul 26 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Apr 14 2002
EXTENSIONS
More terms from Amiram Eldar, Sep 10 2020
STATUS
approved