| /ViaThinkSoft Distributed/src/de/viathinksoft/immortable/gen2/Immortable.java |
|---|
| 114,9 → 114,26 |
| // Should never happen |
| return null; |
| } |
| } |
| public static boolean isImmortable(BigInteger num) { |
| // Alternativ: n²%10^m == n%10^m |
| return num.pow(2).toString().endsWith(num.toString()); |
| } |
| public static String findNextImmortable(String num) { |
| if (!isImmortable(new BigInteger(num))) { |
| return null; |
| } |
| for (int i=1; i<=9; i++) { |
| String s = i+num; |
| if (isImmortable(new BigInteger(s))) { |
| return s; |
| } |
| } |
| return "0"+num; |
| } |
| private Immortable() { |
| } |