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2. Category:Dot patterns - Wikipedia

   en.wikipedia.org/wiki/Category:Dot_patterns

   Download as PDF; Printable version; In other projects ... Figurate numbers (1 C, 51 P) Pages in category "Dot patterns"

3. Figurate number - Wikipedia

   en.wikipedia.org/wiki/Figurate_number

   a number represented as a discrete r-dimensional regular geometric pattern of r-dimensional balls such as a polygonal number (for r = 2) or a polyhedral number (for r = 3). a member of the subset of the sets above containing only triangular numbers, pyramidal numbers , and their analogs in other dimensions.

4. Category:Figurate numbers - Wikipedia

   en.wikipedia.org/wiki/Category:Figurate_numbers

   Print/export Download as PDF; Printable version; In other projects ... This category includes not only articles about certain types of figurate numbers, ...

5. Centered pentagonal number - Wikipedia

   en.wikipedia.org/wiki/Centered_pentagonal_number

   Download as PDF; Printable version ... number is a centered figurate number that represents ... the pattern 1-6-6-1. Centered pentagonal numbers follow the ...

6. Nonagonal number - Wikipedia

   en.wikipedia.org/wiki/Nonagonal_number

   A nonagonal number, or an enneagonal number, is a figurate number that extends the concept of triangular and square numbers to the nonagon (a nine-sided polygon). [1] However, unlike the triangular and square numbers, the patterns involved in the construction of nonagonal numbers are not rotationally symmetrical.

7. Pentagonal number - Wikipedia

   en.wikipedia.org/wiki/Pentagonal_number

   The nth pentagonal number p n is the number of distinct dots in a pattern of dots consisting of the outlines of regular pentagons with sides up to n dots, when the pentagons are overlaid so that they share one vertex. For instance, the third one is formed from outlines comprising 1, 5 and 10 dots, but the 1, and 3 of the 5, coincide with 3 of ...