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Binomial number : ウィキペディア英語版
Binomial number

In mathematics, specifically in number theory, a binomial number is an integer which can be obtained by evaluating a homogeneous polynomial containing two terms. It is a generalization of a Cunningham number.
== Definition ==

A Binomial number is an integer obtained by evaluating a homogeneous polynomial containing two terms, also called a binomial. The form of this binomial is \scriptstyle x^n \,\pm\, y^n, with \scriptstyle x \, > \, y and \scriptstyle n \, > \, 1 . However, since \scriptstyle x^n \,-\, y^n is always divisible by \scriptstyle x \,-\, y, when studying the numbers generated from the version with the negative sign, they are usually divided by \scriptstyle x \,-\, y first. Binomial numbers formed this way form Lucas sequences. Specifically:
:U_n(a+b,ab)=\frac, \, and V_n(a+b,ab)=a^n+b^n \,

Binomial numbers are a generalization of a Cunningham numbers, and it will be seen that the Cunningham numbers are Binomial numbers where \scriptstyle y \,=\, 1 . Other subsets of the Binomial numbers are the Mersenne numbers and the Repunits.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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