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| | PlanetMath: decimal expansion |
 | | (the period length does not change if we multiply the fraction by a suitable power of 10 and then reduce all prime factors of 10 from the denominator). |
 | | In every case, the period length is a factor of the number |
 | | Cross-references: transcendental, irrational number, similar, rational, digit, base, Euler's totient function, factor, prime factors, power, denominator, fraction, necessary, coprime, satisfy, series, integers, positive, rational number |
| planetmath.org /encyclopedia/DecimalExpansion.html (221 words) |
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