\input zb-basic
\input zb-matheduc
\iteman{ZMATH 2014e.00468}
\itemau{Pagni, David}
\itemti{Counting hexagons in a triangle of triangles.}
\itemso{Math. Sch. (Leicester) 43, No. 2, 19-21 (2014).}
\itemab
Based on the initial figure of a regular triangle consisting of equilateral triangles, the article contains an investigation where the task is to find all regular hexagons in such triangles when the number of equilateral-triangle components increases, i.e. when the number of rows of the initial figure increases.
\itemrv{Peter D\"urr (Linkenheim)}
\itemcc{F60 H20 I30}
\itemut{triangular numbers; regular hexagons; equilateral triangles; figurate numbers; series; sum of squares}
\itemli{}
\end