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# Number Theory Forum

Number Theory Help Forum

1. ### Division of a hexadecimal number by another

• Replies: 7
• Views: 23,975
Aug 22nd 2010, 10:17 AM
2. ### Euler's criterion

• Replies: 0
• Views: 19,945
Nov 4th 2010, 08:44 PM
3. ### How to find all the coprimes of a number n in a given range

• Replies: 7
• Views: 13,890
Apr 13th 2009, 03:57 AM
4. ### [SOLVED] Factor x^n - 1

• Replies: 5
• Views: 13,495
Mar 2nd 2009, 12:36 PM
5. ### what is mod??

• Replies: 10
• Views: 13,489
Aug 11th 2006, 09:20 AM
6. ### Prove that the square root of a non-square number is irrational

• Replies: 11
• Views: 10,392
Oct 25th 2009, 06:45 PM
7. ### [SOLVED] Finding the last two digits of a number raised to a large exponent

• Replies: 5
• Views: 10,078
Aug 4th 2009, 01:28 PM
8. ### intersection and union proof

• Replies: 1
• Views: 10,033
Feb 25th 2010, 01:59 PM
9. ### find the least positive residue

• Replies: 5
• Views: 10,000
Mar 21st 2010, 11:23 AM
10. ### prove sqrt(3) + sqrt (5) is an irrational number

• Replies: 2
• Views: 9,942
Oct 6th 2006, 06:48 PM
11. ### Cayley table inverse

• Replies: 4
• Views: 8,507
Jun 6th 2012, 09:44 AM
12. ### What is the last digit of 2^1000

• Replies: 2
• Views: 7,996
Nov 26th 2007, 01:22 PM
13. ### Infinitely many primes with either 4n-1 or 4n+1 ... Questions ...

• Replies: 8
• Views: 7,948
May 29th 2010, 09:46 AM
14. ### Infinite Primes Proof

• Replies: 7
• Views: 7,905
Apr 11th 2005, 08:40 AM
15. ### Proof that an odd number raised to an integral power is odd

• Replies: 7
• Views: 7,582
Sep 1st 2010, 06:28 PM
16. ### Cantor Expansion

• Replies: 1
• Views: 7,425
Feb 5th 2007, 04:06 AM
17. ### Prove that sqrt(5) is irrational?

• Replies: 5
• Views: 7,164
Nov 18th 2010, 10:13 PM
18. ### Proof: limit of ratios of fibonacci numbers is convergent

• Replies: 5
• Views: 7,086
Mar 27th 2012, 08:34 AM
19. ### Euler Function phi(n)

• Replies: 22
• Views: 6,814
May 29th 2010, 07:29 AM
20. ### How to find a primitive root of N

• Replies: 15
• Views: 6,346
Jun 16th 2008, 01:51 PM
21. ### infinitely many primes of the form 6k + 5 and 6K + 1

• Replies: 1
• Views: 6,133
Oct 22nd 2009, 05:25 AM
22. ### Proof by induction: 4^n + 6n + 8 is divisible by 9.

• Replies: 6
• Views: 6,129
Apr 19th 2011, 04:24 PM
23. ### Z is not a field.

• Replies: 3
• Views: 6,108
Feb 2nd 2011, 10:25 AM
24. ### Modulus of negative numbers

• Replies: 7
• Views: 6,083
May 10th 2008, 03:36 PM
25. ### Last 2 digits of 3^400

• Replies: 3
• Views: 5,739
Oct 2nd 2009, 03:39 PM
26. ### Smallest number with given number of factors

• Replies: 1
• Views: 5,703
Apr 26th 2012, 12:05 PM
27. ### Where is the missing number?

• Replies: 8
• Views: 5,656
Apr 14th 2012, 12:20 PM
28. ### Osculator

• Replies: 3
• Views: 5,420
Nov 5th 2010, 02:59 AM
29. ### [SOLVED] Prove that a^p is congruent to b^p (mod p^2) if the same is true mod p

• Replies: 2
• Views: 5,306
Oct 5th 2009, 03:02 PM

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