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A141464
Conjectured to be complete list of numbers not of the form 4*x^2 + 3*triangular number + triangular number.
8
2, 11, 27, 38, 86, 93, 188, 323
OFFSET
1,1
MATHEMATICA
Reap[For[n = 1, n <= 400, n++, If[FindInstance[n == 4x^2 + 3y(y+1)/2 + z(z+1)/2, {x, y, z}, Integers] == {}, Print[n]; Sow[n]]]][[2, 1]] (* Jean-François Alcover, Oct 01 2018 *)
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 05 2008
STATUS
approved