Created
March 8, 2017 04:37
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| def prime?(n) | |
| if n <= 1 | |
| return false | |
| elsif n <= 3 | |
| return true | |
| else (2..n/2).none? do |x| | |
| n % x == 0 | |
| end | |
| end | |
| end |
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