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A141491 Conjectured to be complete list of numbers not of the form 5*x^2 + 3*triangular number + 2*triangular number. 8
1, 4, 13, 19, 27, 46, 73, 97, 111, 123, 151, 168 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
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 <= 200, n++, If[FindInstance[n == 5x^2 + 3y(y+1)/2 + 2z(z+1)/2, {x, y, z}, Integers] == {}, Print[n]; Sow[n]]]][[2, 1]] (* Jean-François Alcover, Oct 01 2018 *)
CROSSREFS
Sequence in context: A191253 A075327 A267767 * A292363 A119048 A241264
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 05 2008
STATUS
approved

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Last modified February 26 09:41 EST 2024. Contains 370338 sequences. (Running on oeis4.)