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DIV - Divisors |
Let N be a positive integer. In theory it is easy to decide if d(N) (the number of positive divisors of N including 1 and N) is prime or not. Your task is just a little bit harder: compute all N in [1,10^6] for which d(N)=p*q where p and q distinct primes.
Input
There is no input for this problem.
Output
To make the problem less io related write out only every 9-th of them, one per line.
Output: 50 99 162 ... 999524 999728 999927
Added by: | czylabsonasa |
Date: | 2005-05-16 |
Time limit: | 0.705s |
Source limit: | 3333B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All |
Resource: | Folklore. |
hide comments
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2024-08-03 12:54:37
learn how to do prime decomposition of a number(finding prime divisors of a number) in logarithmic time and do this. |
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2023-08-20 23:24:43
Really fun problem. Tested my Sieve and Prime Decomposition knowledge. AC in one go. |
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2020-10-22 16:43:21
I have successfully printed the values but still getting the wrong answer. Can someone help!!! |
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2020-07-15 16:26:29
I'm finding num of divisors for each number using prime factorization method and then making a check of O(1). not using a sieve. still getting TLE in cpp. any improvements which I can do? [NG]: Try using a sieve. Also your factorization method is poor, take on FACTCG2 for practice. Don't post code / source links here, use the forum for questions or hints. Last edit: 2020-07-15 19:47:30 |
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2020-07-12 20:26:18 Shubham Jadhav
Fun problem! Thanks @Hendra Jaya for the hint |
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2019-07-21 17:37:22
AC in one hit .... Nice one seive + prime factorization |
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2018-10-07 18:29:55
is there anyone from india practicing for ICPC? |
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2018-06-11 22:34:41
consider 32,243.... also as numbers whose no of divisor is represented by p*q 32-> (5+1 distinct divisors)->6=3X2 |
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2018-01-16 15:39:24
east! AC in one go |
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2017-12-30 20:15:04
requires a lot of optimization |