LCMSUM - LCM Sum
Given n, calculate the sum LCM(1,n) + LCM(2,n) + .. + LCM(n,n), where LCM(i,n) denotes the Least Common Multiple of the integers i and n.
Input
The first line contains T the number of test cases. Each of the next T lines contain an integer n.
Output
Output T lines, one for each test case, containing the required sum.
Example
Sample Input: 3 1 2 5 Sample Output: 1 4 55
Constraints
1 <= T <= 300000
1 <= n <= 1000000
hide comments
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sid779:
2019-07-01 19:17:11
AC in one go but I looked for the proof on google as I can't think of a solution :( |
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whyamievenhere:
2018-12-20 17:28:09
Again man useless time limits, how the heck are we supposed to find divisors of a number range without sieve?? |
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DK...:
2018-08-30 18:43:29
i got TL using pragma's, but AC without them...
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uvshuvo:
2018-06-29 01:30:42
Learned a lot about phi function nice math logic Thanks. Last edit: 2018-06-29 01:34:23 |
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crackeree:
2018-05-03 14:49:26
how alien i m. everyone is getting TLE .. and i m getting WA..
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chetan4060:
2018-01-01 09:51:18
nice math used:) |
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epsilonalpha:
2017-12-14 07:37:25
It's a must do NT problem.
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shub120798:
2017-09-27 08:51:33
really nice prblm.. pre-compute each and every thing to avoid tle;..
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rohit9934:
2017-06-30 13:09:54
I have got so many TLE's in this
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da_201501181:
2017-04-02 13:54:53
Learned a lot..!! Nice Question..!! |
| Added by: | Varun Jalan |
| Date: | 2010-01-24 |
| Time limit: | 0.527s |
| Source limit: | 50000B |
| Memory limit: | 1536MB |
| Cluster: | Cube (Intel G860) |
| Languages: | All except: PERL6 |
| Resource: | own problem used for Codechef Snackdown Onsite |
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