1 | static bool isPrime(int n) {
|
2 | if ((n > 2 && (n & 1) == 0) // check is it even |
3 | || n <= 1 //check for -ve |
4 | || (n > 3 && (n % 3 == 0))) // check for 3 divisable |
5 | false; |
6 | |
7 | int maxLookup = (int) Math.sqrt(n); |
8 | for (int i = 3; (i+2) <= maxLookup; i = i + 6) |
9 | if (n % (i+2) == 0 || n % (i+4) == 0) false; |
10 | true; |
11 | } |
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| Snippet ID: | #1010223 |
| Snippet name: | isPrime - check if a number is prime |
| Eternal ID of this version: | #1010223/3 |
| Text MD5: | 5335f90ad1a9118ebb19f92bda6891e4 |
| Author: | stefan |
| Category: | javax / maths |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2017-09-06 21:20:54 |
| Source code size: | 338 bytes / 11 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 438 / 449 |
| Version history: | 2 change(s) |
| Referenced in: | [show references] |