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A141497
Conjectured to be complete list of numbers not of the form 2*x^2 + 4*triangular number + 5*triangular number.
8
1, 3, 10, 16, 28, 43, 46, 85, 169, 175, 211, 223
OFFSET
1,2
MATHEMATICA
Reap[For[n = 1, n <= 300, n++, If[FindInstance[n == 2x^2 + 4y(y+1)/2 + 5z(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