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An ugly number is a positive integer whose prime factors are limited to
Given an integer
n is an ugly number.
Input: n = 6 Output: true Explanation: 6 = 2 × 3
Input: n = 1 Output: true Explanation: 1 has no prime factors, therefore all of its prime factors are limited to 2, 3, and 5.
Input: n = 14 Output: false Explanation: 14 is not ugly since it includes the prime factor 7.
-231 <= n <= 231 - 1
for (int i=2; i<6 && num; i++) while (num % i == 0) num /= i; return num == 1;
for p in 2, 3, 5: while num % p == 0 < num: num /= p return num == 1
for (int i=2; i<6 && num>0; i++) while (num % i == 0) num /= i; return num == 1;
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