[br]The general formula of difference between [b]K-angular [/b]and [b](K-1)-angular number [/b]with [b]index n [/b](n>0):[br][math]R_n=\frac{n\left(n-1\right)}{2}[/math][br]The [i]general formula [/i]of calculation of any [b]K-angular number with index n[/b]:[br][math]K_n=3n+\frac{(K-3)n(n-1)}{2}[/math]

Inspired by [b]prof. Liudmyla Gryzun[/b], G.S.Scovorodu Kharkiv National Pedagogical University