# power of an integer

Let $n$ be a non zero integer of absolute value^{} not equal to one. The *power* of $n$, written $P(n)$ is defined by :

$$P(n)=\frac{\mathrm{log}|n|}{\mathrm{log}\mathrm{rad}(n)}.$$ |

where $\mathrm{rad}(n)$ is the radical^{} of the integer $n$.^{1}^{1}Since $|n|\ne 1$, we have $\mathrm{rad}(n)\ne 1$ also, so the denominator will not be equal to zero

If $n={m}^{k}$, then $P(n)=kP(m)$; in particular, if $n$ is a prime power, $n={p}^{k}$, then $P(n)=k$. This observation explains why the term “power” is used for this concept. At the same time, it is worth pointing out that, in general, the power of an integer will not itself be an integer. For instance,

$$P(12)=\frac{\mathrm{log}12}{\mathrm{log}\mathrm{rad}(12)}=\frac{\mathrm{log}12}{\mathrm{log}6}=1.3868\mathrm{\dots}$$ |

Note that it doesn’t matter what base one uses to compute the logarithm (as long as one uses the same base to compute the logarithm on the numerator and in the denominator!) because, upon changing base, both numerator and denominator will be multiplied by the same factor.

Title | power of an integer |
---|---|

Canonical name | PowerOfAnInteger |

Date of creation | 2013-03-22 14:22:17 |

Last modified on | 2013-03-22 14:22:17 |

Owner | rspuzio (6075) |

Last modified by | rspuzio (6075) |

Numerical id | 18 |

Author | rspuzio (6075) |

Entry type | Definition |

Classification | msc 11N25 |

Synonym | power |

Related topic | RadicalOfAnInteger |