tähtarvuline
Tähtarvuline is an Estonian term that translates to "star number" or "stellar number." It refers to a specific type of figurate number, which are numbers represented by a geometric arrangement of dots. In the case of tähtarvuline, the arrangement forms a star.
The nth tähtarvuline is calculated using the formula n(2n - 1). For example, the first tähtarvuline (n=1)
Geometrically, tähtarvuline can be visualized by arranging dots in concentric star shapes. The first star consists
Tähtarvuline are a subset of polygonal numbers and have connections to other number sequences. They are sometimes