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HS08PAUL - A conjecture of Paul Erdős |
In number theory there is a very deep unsolved conjecture of the Hungarian Paul Erdős (1913-1996), that there exist infinitely many primes of the form x2+1, where x is an integer. However, a weaker form of this conjecture has been proved: there are infinitely many primes of the form x2+y4. You don't need to prove this, it is only your task to find the number of (positive) primes not larger than n which are of the form x2+y4 (where x and y are integers).
Input
An integer T, denoting the number of testcases (T≤10000). Each of the T following lines contains a positive integer n, where n<10000000.
Output
Output the answer for each n.
Example
Input: 4 1 2 10 9999999 Output: 0 1 2 13175
Added by: | Robert Gerbicz |
Date: | 2009-04-05 |
Time limit: | 1s |
Source limit: | 4096B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 JS-MONKEY |
Resource: | High School Programming League 2008/09 |
hide comments
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2022-06-10 19:14:41
Applied a brute-force method without really getting into the maths |
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2021-07-01 01:50:10
I got the soln now. Last edit: 2021-07-03 07:05:33 |
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2021-05-03 08:41:19
got it at last :3 |
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2021-04-12 06:41:32
I cannot figure out how to solve this with sieve, someone please give me a hint |
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2020-07-03 19:38:16
100th AC :) Easy sieve. |
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2020-05-29 20:39:31
easy Last edit: 2020-06-04 09:16:39 |
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2020-04-04 12:27:44
Great Question Finally Solved it |
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2017-05-11 17:37:38 Shubham Jadhav
Nice Problem. AC in one go :) |
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2015-08-02 11:14:02 Ankit
good one:) |
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2015-02-02 14:07:51 [Lakshman]
Something strange happend with my code. My last Ac took .20s today I changes my bool arr[] to vector (Mitch) That's because of template specialisation. Last edit: 2015-02-02 15:28:49 |