An expression that is of a given type. For example, all primes are "of the form" . The term "of shape" is sometimes also used.

Wells, D. The Penguin Dictionary of Curious and Interesting Numbers. Middlesex, England: Penguin Books, p. 13, 1986.

CITE THIS AS:

Weisstein, Eric W. "Of the Form." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/OftheForm.html