A pyramidal number is a figurate number that represents a pyramid with a base and a given number of sides. The term is most often used to refer to square pyramidal numbers, which have four sides, but it can also refer to:

the formula for a r-gonal pyramid number is:

X= \frac{3n^2+n^3[r-2]-n[r-5]}{6}

This is a disambiguation page: a list of articles associated with the same title. If you arrived here from another page, you may wish to go back to that page and change the link to point directly to the intended article.
ar:عدد هرمي

da:Pyramidetaleo:Piramida nombro pl:Liczby piramidalne

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.