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Forum: Challenge Questions and Puzzles

Have a challenging question or puzzle you want to share with the community? Post it here (homework questions do NOT belong here).

  1. Sticky Thread Sticky Threads

    • Replies: 1
    • Views: 1,811
    October 8th, 2013, 03:20 Go to last post
  1. Normal Thread Normal Threads

  2. find n

    Started by kaliprasad, September 19th, 2017 10:15
    $n+3$, $n^2+3$, cubes, find, perfect
    • Replies: 2
    • Views: 74
    Today, 11:45 Go to last post
  3. Evaluate the product

    Started by lfdahl, September 18th, 2017 17:07
    ;;;, evaluate, n.], product, [lim_nto
    • Replies: 1
    • Views: 74
    Yesterday, 15:36 Go to last post
  4. Particle trajectory

    Started by lfdahl, September 5th, 2017 16:12
    2 Pages
    1 2
    equation, identify, moves, particle, trajectory
    • Replies: 10
    • Views: 264
    September 20th, 2017, 18:55 Go to last post
  5. Counting Squares Challenge

    Started by lfdahl, September 18th, 2017 16:52
    counting, diagonal, fracn^4-n^212$, grid, squares
    • Replies: 2
    • Views: 84
    September 20th, 2017, 13:58 Go to last post
  6. smallest number

    Started by kaliprasad, September 19th, 2017 06:51
    digits, divisible, made, number, smallest
    • Replies: 0
    • Views: 46
    September 19th, 2017, 06:51 Go to last post
  7. Number of positive divisors less than 7

    Started by lfdahl, September 16th, 2017 16:10
    $1$, $a$, divisors, number, positive
    • Replies: 2
    • Views: 91
    September 18th, 2017, 14:18 Go to last post
  8. Polynomial in n variables: Prove the identity

    Started by lfdahl, September 10th, 2017 17:09
    $1$, $f$, identity, polynomial, prove
    • Replies: 1
    • Views: 82
    September 15th, 2017, 14:54 Go to last post
  9. Double integral challenge

    Started by lfdahl, September 13th, 2017 16:26
    8y^4+y, double, int, integral, plane
    • Replies: 6
    • Views: 152
    September 15th, 2017, 03:16 Go to last post
  10. Prove the existence of an equilateral triangle

    Started by lfdahl, September 7th, 2017 17:12
    $c$, equilateral, point, prove, triangle
    • Replies: 1
    • Views: 78
    September 12th, 2017, 15:03 Go to last post
  11. find a,b

    Started by Albert, September 10th, 2017 22:24
    1$12^2+39^2+a^2=b^2$, 2$12^2+24^2+a^2=b^2$, bin, find
    • Replies: 2
    • Views: 87
    September 12th, 2017, 02:01 Go to last post
  12. axiomatics

    Started by solakis, September 11th, 2017 19:35
    a+b=0vee, aa=bblongrightarrow, axiomatics, forall, prove
    • Replies: 0
    • Views: 50
    September 11th, 2017, 19:35 Go to last post
  13. Sum of cubic roots yields an integer

    Started by lfdahl, September 7th, 2017 17:06
    cubic, integer, roots, sum, yields
    • Replies: 4
    • Views: 153
    September 11th, 2017, 08:15 Go to last post
  14. Non-negative rational solutions ...

    Started by lfdahl, September 4th, 2017 15:50
    • Replies: 3
    • Views: 110
    September 9th, 2017, 16:38 Go to last post
  15. find positive integers x,y,z

    Started by Albert, September 4th, 2017 21:55
    $find$, find, integers, positive
    • Replies: 9
    • Views: 177
    September 7th, 2017, 05:31 Go to last post
  16. TikZ Challenge 2 - Function Graph

    Started by I like Serena, September 5th, 2017 18:49
    create, picture, submission, thread, tikz
    • Replies: 1
    • Views: 94
    September 6th, 2017, 17:20 Go to last post
  17. How short a leg can it be?

    Started by lfdahl, September 5th, 2017 15:56
    2001, leg, length, short, triangle
    • Replies: 2
    • Views: 114
    September 6th, 2017, 13:46 Go to last post
  18. TikZ Challenge 1

    Started by I like Serena, August 22nd, 2017 14:45
    challenge, examples, figure, make, tikz
    • Replies: 5
    • Views: 254
    September 5th, 2017, 18:16 Go to last post
  19. Poll: TikZ Challenge 1 - Voting

    Started by I like Serena, September 5th, 2017 18:09
    coordinate, left], node[above, node[below, path
    • Replies: 0
    • Views: 110
    September 5th, 2017, 18:09 Go to last post
  20. Only one possible N-value

    Started by lfdahl, September 3rd, 2017 15:34
    $n$, find, integers, positive, show
    • Replies: 9
    • Views: 182
    September 5th, 2017, 14:34 Go to last post
  21. A finite number of positive integer solutions

    Started by lfdahl, September 3rd, 2017 17:09
    equation, finite, integer, number, solutions
    • Replies: 4
    • Views: 130
    September 5th, 2017, 12:58 Go to last post
  22. Find maximal a-value and minimal b-value

    Started by lfdahl, August 26th, 2017 17:15
    find, maximal, minimal, natural, numbers
    • Replies: 6
    • Views: 192
    September 3rd, 2017, 15:14 Go to last post
  23. Polynomials with no real roots

    Started by lfdahl, August 30th, 2017 16:12
    2nx+2n+1, polynomials, real, roots
    • Replies: 4
    • Views: 169
    September 2nd, 2017, 16:39 Go to last post
  24. Evaluate the integral

    Started by lfdahl, September 1st, 2017 17:03
    definite, evaluate, integral, mathbbr_+
    • Replies: 2
    • Views: 105
    September 2nd, 2017, 12:17 Go to last post
  25. Isosceles trangle

    Started by lfdahl, August 28th, 2017 16:48
    • Replies: 2
    • Views: 101
    August 30th, 2017, 16:02 Go to last post
  26. Rational trigonometric expression

    Started by lfdahl, August 28th, 2017 16:21
    $$tan^2, expression, rational, show, trigonometric
    • Replies: 2
    • Views: 132
    August 29th, 2017, 13:21 Go to last post
  27. Powerful equation ...

    Started by lfdahl, August 21st, 2017 16:26
    equation, find, natural, numbers, powerful
    • Replies: 7
    • Views: 223
    August 29th, 2017, 13:01 Go to last post
  28. Solve the equations

    Started by lfdahl, August 13th, 2017 17:41
    $y$, equations, satisfy, solve, [8x^2-2xy^2
    • Replies: 4
    • Views: 210
    August 24th, 2017, 01:42 Go to last post

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