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A141386
Conjectured to be complete list of numbers not of the form x^2 + y^2 + 5*triangular number.
8
3, 11, 12, 27, 129, 138, 273
OFFSET
1,1
MATHEMATICA
Reap[For[n = 1, n <= 300, n++, If[FindInstance[n == x^2 + y^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