The EKG sequence is a sequence of positive integers generated as follows: The first two numbers of the sequence are 1 and 2. Each successive entry is the smallest positive integer not already used that shares a factor with the preceding term. So, the third entry in the sequence is 4 (being the smallest even number not yet used). The next number is 6 and the next is 3. The first few numbers of this sequence are given below.
1, 2, 4, 6, 3, 9, 12, 8, 10, 5, 15, 18, 14, 7, 21, 24, 16, 20, 22, 11, 33, 27
Input consists of a number of test cases. Each case will be a line containing a single integer n, 1 <= n <= 300000. An input of 0 follows the last test case. Note that the portion of the EKG sequence that contains all integers <= 300,000 will not contain an integer >1,000,000.
Each test case should produce one line of output of the form:
The number n appears in location p.
where n is the number given and p is the position of n in the EKG sequence. You are guaranteed that p will be no larger than 1,000,000.
12 21 2 33 100000 299977 0
The number 12 appears in location 7. The number 21 appears in location 15. The number 2 appears in location 2. The number 33 appears in location 21. The number 100000 appears in location 97110. The number 299977 appears in location 584871.
Migrated from old NTUJ.
East Central North America 2003
| No. | Testdata Range | Score |
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