Special Numbers

Query polygonal numbers and do calculations with them or check whether values are members of a figurate number class.

Compute a polygonal number:

Determine whether a number belongs to a given class:

Analyze numbers in terms of their relationship with the sum of their divisors.

Determine whether a number belongs to a given class:

Find a number or a set of numbers meeting certain criteria or check whether an individual value meets specified criteria.

Find a number matching specified criteria:

Find numbers matching specified criteria:

Query elements and rows of this famous triangle or analyze the values of its elements subject to a modulus or other condition.

Generate Pascal's triangle:

Compute Pascal's triangle modulo an integer: