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The identity F_n^4-F_(n-2)F_(n-1)F_(n+1)F_(n+2)=1, where F_n is a Fibonacci number.

Any prime number other than 2 (which is the unique even prime). Humorously, 2 is therefore the "oddest" prime.

F_mF_(n+1)-F_nF_(m+1)=(-1)^nF_(m-n), where F_n is a Fibonacci number.

Consider the process of taking a number, adding its digits, then adding the digits of the number derived from it, etc., until the remaining number has only one digit. The ...

A number which does not divide another exactly. For instance, 4 and 5 are aliquant divisors of 6. A number which is not an aliquant divisor (i.e., one that does divide ...

A quantity which does not equal zero is said to be nonzero. A real nonzero number must be either positive or negative, and a complex nonzero number can have either real or ...

A group in which any decreasing chain of distinct subgroups terminates after a finite number.

The number of inward directed graph edges from a given graph vertex in a directed graph.

The set theory symbol (aleph) for the cardinal number of a well-orderable infinite set.

omega^epsilon=epsilon, where omega is an ordinal number and epsilon is an inaccessible cardinal.