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pentagonal number
(redirected from Pentagonal numbers)

    Also found in: Wikipedia 0.01 sec.
pentagonal number [pen′tag·ən·əl ¦nəm·bər]
(mathematics)
The total number,P(n), of dots marking off unit segments of the sides of a set ofn- 1 nested pentagons, given by the formulaP(n) =n(3n- 1)/2.
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The dot patterns of counting numbers, triangular numbers, square numbers and pentagonal numbers connect into ideas associated with sequences and algebra.
Establishing a mathematics-enrichment community in a multi-school ... by Thomson, Ian / Australian Mathematics Teacher
Pentagonal numbers Hopefully you found the sequence for Pn to be 1, 5, 12, 22, 35, 51, 70, 92, with the gnomons being the sequence 4, 7, 10, 13, 16, 19, 22, i.
Sum fun with gnomons! or take the Gausswork out of it! by Squire, Barry / Australian Mathematics Teacher
 
 
 
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