%I #12 Sep 08 2022 08:45:48
%S 0,1,9,784
%N Numbers k with property that 4 + 2*k + 3*k^3 is a square.
%C 4 + 2*k + 3*k^3 = m^2 with k = {0,1,9,784} = {0,1,3,28}^2, and m = 2,3,47,38022.
%o (Magma)[n: n in [0..10000000]|IsSquare(4+2*n+3*n^3)] // _Vincenzo Librandi_, Dec 16 2010
%K fini,full,nonn
%O 0,3
%A _Zak Seidov_, Nov 21 2009