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# Number Theory Forum

Number Theory Help Forum

1. ### # of binomial coefficients not divisible by 3 is not divisible by 5

• Replies: 5
• Views: 1,244
Jan 1st 2010, 01:59 AM
2. ### # of integer solutions

• Replies: 3
• Views: 1,306
Mar 2nd 2011, 09:43 PM
3. ### Φn(x)

• Replies: 7
• Views: 778
Oct 30th 2008, 08:05 AM
4. ### σ number theory proofs?

• Replies: 0
• Views: 608
Nov 30th 2009, 08:30 AM
5. ### σ sum of divisors proof

• Replies: 2
• Views: 2,188
Nov 30th 2009, 02:39 AM
6. ### "Interesting" connection between prime numbers and the fib seq. Pls critique

• Replies: 1
• Views: 900
Jul 16th 2009, 01:06 PM
7. ### "order" of a mod m & quadratic residues

• Replies: 2
• Views: 324
Mar 1st 2010, 05:44 PM
8. ### [SOLVED] "sum of numbers = product of that numbers" problem

• Replies: 4
• Views: 672
Aug 2nd 2011, 11:23 PM
9. ### "Sum of" question

• Replies: 1
• Views: 347
Nov 14th 2009, 08:17 AM
10. ### "Weighted" sum of divisor function

• Replies: 0
• Views: 764
Aug 18th 2013, 04:21 PM
11. ### 'Reversing' Euclidean algorithm

• Replies: 2
• Views: 504
Dec 28th 2009, 04:22 PM
12. ### (10n+3,5n+2)=1

• Replies: 2
• Views: 1,114
Apr 12th 2011, 04:41 PM
13. ### (3n+1, 5n+2)=1

• Replies: 2
• Views: 522
Sep 14th 2009, 06:56 PM
14. ### (3^m)(5^n)(11^k) is not a perfect number

• Replies: 1
• Views: 863
Apr 7th 2012, 11:38 AM
15. ### (a,b,c) = ((a,b),c)

• Replies: 2
• Views: 648
Mar 18th 2009, 11:18 PM
16. ### (a,p)=1,(n,p-1)=1 then x^n congruent a mod p has exactly one solution

• Replies: 1
• Views: 480
Aug 1st 2008, 10:01 AM
17. ### (a;b)=(a;a+b)

• Replies: 4
• Views: 1,092
Nov 4th 2012, 10:15 AM
18. ### (easy?) Proof: divisors and primality

• Replies: 1
• Views: 694
Feb 10th 2009, 08:11 PM
19. ### (mod n)

• Replies: 4
• Views: 421
Mar 2nd 2017, 12:54 AM
20. ### (n!(j)+1,n!(j)+1)=1 for 1<=i<j<=n

• Replies: 2
• Views: 581
Sep 24th 2009, 12:38 AM
21. ### (n) inverse modulo m

• Replies: 1
• Views: 592
Feb 21st 2009, 10:49 AM
22. ### (n,k) in binomial coefficients

• Replies: 2
• Views: 809
Oct 14th 2013, 08:08 PM
23. ### (Non Standard) ordering of a set

• Replies: 1
• Views: 821
Nov 26th 2014, 08:26 AM
24. ### (n^2 - n)+41 : factorising the composite values of this polynomial. Comments?

• Replies: 0
• Views: 358
Nov 22nd 2017, 09:48 AM
25. ### (Perfect) Squares

• Replies: 2
• Views: 3,169
Feb 20th 2007, 11:36 AM
26. ### (p^m)(q^n) Distinct Odd Primes

• Replies: 2
• Views: 715
Apr 11th 2012, 01:40 PM
27. ### (x+1)! + (y+1)! = x^2 x y^2

• Replies: 5
• Views: 562
Jul 2nd 2011, 09:33 PM
28. ### (x^2 + y^2)/xy > 2

• Replies: 4
• Views: 636
Nov 4th 2009, 04:45 AM

• Replies: 2
• Views: 1,595
Jun 16th 2005, 04:17 PM
30. ### *sigh*... need to prove somthing...

• Replies: 8
• Views: 696
Jun 6th 2008, 11:52 AM

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