$f(1)=2$, $f(2)=5$, $f(3)=10$, $f(4)=17$ — yes! But cubic? Yes, with leading coefficient zero. But the problem says cubic, so perhaps we assume non-degenerate. But the interpolation is unique for degree at most 3, and this fits.

Sun, 03 May 2026 16:10:06 +0000

Content under review