Pentagonal number A visual representation of the first six pentagonal numbers A pentagonal number is a figurate number that extends the concept of triangular and square numbers to the …

Figure 1 – Pentagonal Numbers Figure 1 illustrates the graphical view of three pentagonal numbers. Like square and triangle numbers, pentagonal numbers are figurate numbers. A …

Pentagonal number A pentagonal number, like square numbers and triangular numbers, is a type of figurate number. A figurate number is a number that can be represented using a regular …

Define pentagonal. pentagonal synonyms, pentagonal pronunciation, pentagonal translation, English dictionary definition of pentagonal. pentagon n. 1. A polygon with five sides and five …

Illustrated definition of Pentagonal Number: A number that can be shown as a pentagonal pattern of dots. The first five pentagonal numbers are 1, 5, 12, 22...

pentagonal, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Definition of 'pentagonal' pentagonal in British English adjective (of a polygon) having five straight sides

Definition of pentagonal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

2 = 2 : The numbers 2 are called \pentagonal numbers" because they count the number of dots in a pentagonal pattern, just k(k+1) as the numbers n = and n = k2 are \triangular numbers" and …

Jul 23, 2025 · The first three pentagonal numbers are 1, 5, and 12 (Please see the below diagram). The n'th pentagonal number P n is the number of distinct dots in a pattern of dots …