A141443 Conjectured to be complete list of numbers not of the form 2*x^2 + y^2 + 12*triangular number.

5, 7, 10, 26, 35, 65, 92, 127, 322

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Ben Kane and Zhi-Wei Sun, On almost universal mixed sums of squares and triangular numbers, arXiv:0808.2761

Mathematica

Reap[For[n=1, n <= 400, n++, If[FindInstance[n == 2x^2 + y^2 + 12z(z+1)/2, {x, y, z}, Integers] == {}, Print[n]; Sow[n]]]][[2, 1]] (* Jean-François Alcover, Oct 01 2018 *)

Crossrefs

Cf. A141273, A141386, A141423, A141428, A141463.

Cf. A141464, A141491, A141497.

Sequence in context: A339211 A088768 A131998 * A215660 A015849 A059303

Adjacent sequences: A141440 A141441 A141442 * A141444 A141445 A141446

Keyword

nonn

Author

N. J. A. Sloane, Sep 05 2008

Status

approved