In number theory, an unusual number is a natural number n whose largest prime factor is strictly greater than n {\displaystyle {\sqrt {n}}} . A k-smooth number has all its prime factors less than or equal to k, therefore, an unusual number is non- n {\displaystyle {\sqrt {n}}} -smooth.
In number theory, an unusual number is a natural number n whose largest prime factor is strictly greater than n {\displaystyle {\sqrt {n}}} . A k-smooth number has all its prime factors less than or equal to k, therefore, an unusual number is non- n {\displaystyle {\sqrt {n}}} -smooth.
Source: Wikipedia "Unusual number" · CC BY-SA 4.0
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