# Number Theory Forum

Number Theory Help Forum

1. ### Group Theory - Prove that for ab-cd=1, there is no cancellation for (a+c)/(b+d)

• Replies: 1
• Views: 736
Feb 2nd 2011, 08:29 AM
2. ### Prove a large number is prime

• Replies: 9
• Views: 1,070
Feb 1st 2011, 10:17 PM
3. ### [SOLVED] number theory: proof required!

• Replies: 2
• Views: 577
Feb 1st 2011, 02:42 PM
4. ### Reducing number of divisions!

• Replies: 3
• Views: 1,002
Jan 31st 2011, 11:05 AM
5. ### Is this easily solvable without a computer?

• Replies: 3
• Views: 494
Jan 30th 2011, 08:21 PM
6. ### Help with proof

• Replies: 4
• Views: 516
Jan 30th 2011, 07:14 AM
7. ### Modulo of fibonacci sequence

• Replies: 1
• Views: 722
Jan 29th 2011, 02:08 AM
8. ### GCD question

• Replies: 6
• Views: 764
Jan 28th 2011, 06:53 AM
9. ### irrational numbers

• Replies: 3
• Views: 795
Jan 28th 2011, 12:49 AM
10. ### Addition of inequalities for real numbers

• Replies: 6
• Views: 608
Jan 26th 2011, 05:14 PM
11. ### two's complement

• Replies: 2
• Views: 1,132
Jan 26th 2011, 02:06 PM
12. ### Proof by Induction

• Replies: 2
• Views: 407
Jan 25th 2011, 06:48 PM
13. ### Prove composite number has a prime divisor

• Replies: 3
• Views: 883
Jan 25th 2011, 04:44 PM
14. ### Diophantine equation problem.

• Replies: 2
• Views: 541
Jan 25th 2011, 12:55 PM

• Replies: 0
• Views: 638
Jan 24th 2011, 04:49 PM
16. ### Publishing prime pattern - question?

• Replies: 9
• Views: 753
Jan 23rd 2011, 02:00 PM

• Replies: 1
• Views: 473
Jan 23rd 2011, 11:43 AM
18. ### Help with divisibility proof

• Replies: 2
• Views: 601
Jan 23rd 2011, 11:39 AM
19. ### Prove if ad - bc = 1 or -1, then gcd(a+b, c+d) = 1

• Replies: 3
• Views: 3,321
Jan 23rd 2011, 09:41 AM
20. ### [SOLVED] Need some help with complex functions... :(

• Replies: 3
• Views: 480
Jan 23rd 2011, 03:44 AM
21. ### Non-algebraic pattern - multiplication by 11 - decimology.

• Replies: 9
• Views: 1,067
Jan 21st 2011, 12:45 PM
22. ### Fibonacci Sequence - Induction Proof

• Replies: 2
• Views: 1,436
Jan 19th 2011, 03:41 PM
23. ### Help with elem. proof

• Replies: 6
• Views: 665
Jan 19th 2011, 12:42 PM
24. ### Fermat's little theorem help!

• Replies: 4
• Views: 677
Jan 17th 2011, 08:16 PM
25. ### Cannot find the contradiction

• Replies: 4
• Views: 712
Jan 17th 2011, 03:35 AM
26. ### Diophantine equation

• Replies: 7
• Views: 845
Jan 16th 2011, 01:06 PM
27. ### what is the least # of boxes that will hold exactly 300 cu m of sand.

• Replies: 12
• Views: 708
Jan 16th 2011, 06:22 AM
28. ### Finding the number of numbers with odd divisors

• Replies: 1
• Views: 1,101
Jan 16th 2011, 04:05 AM
29. ### Greatest Common Divisor of (9m+8, 6m+5)

• Replies: 1
• Views: 654
Jan 15th 2011, 05:43 AM
30. ### Ad hoc summation of series

• Replies: 26
• Views: 1,752
Jan 14th 2011, 05:12 PM

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