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# Number Theory Forum

Number Theory Help Forum

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

• Replies: 7
• Views: 23,133
Aug 22nd 2010, 11:17 AM
2. ### Euler's criterion

• Replies: 0
• Views: 19,871
Nov 4th 2010, 09:44 PM
3. ### How to find all the coprimes of a number n in a given range

• Replies: 7
• Views: 13,593
Apr 13th 2009, 04:57 AM
4. ### what is mod??

• Replies: 10
• Views: 13,422
Aug 11th 2006, 10:20 AM
5. ### [SOLVED] Factor x^n - 1

• Replies: 5
• Views: 12,900
Mar 2nd 2009, 01:36 PM
6. ### Prove that the square root of a non-square number is irrational

• Replies: 11
• Views: 10,069
Oct 25th 2009, 07:45 PM
7. ### intersection and union proof

• Replies: 1
• Views: 9,726
Feb 25th 2010, 02:59 PM
8. ### [SOLVED] Finding the last two digits of a number raised to a large exponent

• Replies: 5
• Views: 9,664
Aug 4th 2009, 02:28 PM
9. ### find the least positive residue

• Replies: 5
• Views: 9,656
Mar 21st 2010, 12:23 PM
10. ### prove sqrt(3) + sqrt (5) is an irrational number

• Replies: 2
• Views: 9,375
Oct 6th 2006, 07:48 PM
11. ### Cayley table inverse

• Replies: 4
• Views: 7,991
Jun 6th 2012, 10:44 AM
12. ### Infinite Primes Proof

• Replies: 7
• Views: 7,733
Apr 11th 2005, 09:40 AM
13. ### What is the last digit of 2^1000

• Replies: 2
• Views: 7,701
Nov 26th 2007, 02:22 PM
14. ### Infinitely many primes with either 4n-1 or 4n+1 ... Questions ...

• Replies: 8
• Views: 7,584
May 29th 2010, 10:46 AM
15. ### Proof that an odd number raised to an integral power is odd

• Replies: 7
• Views: 7,209
Sep 1st 2010, 07:28 PM
16. ### Cantor Expansion

• Replies: 1
• Views: 6,952
Feb 5th 2007, 05:06 AM
17. ### Prove that sqrt(5) is irrational?

• Replies: 5
• Views: 6,944
Nov 18th 2010, 11:13 PM
18. ### Proof: limit of ratios of fibonacci numbers is convergent

• Replies: 5
• Views: 6,740
Mar 27th 2012, 09:34 AM
19. ### Euler Function phi(n)

• Replies: 22
• Views: 6,649
May 29th 2010, 08:29 AM
20. ### How to find a primitive root of N

• Replies: 15
• Views: 6,187
Jun 16th 2008, 02:51 PM
21. ### Modulus of negative numbers

• Replies: 7
• Views: 6,048
May 10th 2008, 04:36 PM
22. ### Proof by induction: 4^n + 6n + 8 is divisible by 9.

• Replies: 6
• Views: 5,823
Apr 19th 2011, 05:24 PM
23. ### infinitely many primes of the form 6k + 5 and 6K + 1

• Replies: 1
• Views: 5,800
Oct 22nd 2009, 06:25 AM
24. ### Where is the missing number?

• Replies: 8
• Views: 5,493
Apr 14th 2012, 01:20 PM
25. ### Last 2 digits of 3^400

• Replies: 3
• Views: 5,451
Oct 2nd 2009, 04:39 PM
26. ### Z is not a field.

• Replies: 3
• Views: 5,443
Feb 2nd 2011, 11:25 AM
27. ### Square Root as a fraction?

• Replies: 4
• Views: 5,092
Dec 9th 2009, 07:53 AM
28. ### Smallest number with given number of factors

• Replies: 1
• Views: 5,051
Apr 26th 2012, 01:05 PM
29. ### [SOLVED] Prove that a^p is congruent to b^p (mod p^2) if the same is true mod p

• Replies: 2
• Views: 4,965
Oct 5th 2009, 04:02 PM

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