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A141423
Conjectured to be complete list of numbers not of the form 3*x^2 + 4*y^2 + triangular number.
8
2, 11, 23, 50, 116, 135, 138
OFFSET
1,1
MATHEMATICA
Reap[For[n = 1, n <= 200, n++, If[FindInstance[n == 3x^2 + 4y^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