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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: 1,785
    October 8th, 2013, 03:20 Go to last post
  1. Normal Thread Normal Threads

  2. Solve the equations

    Started by lfdahl, August 13th, 2017 17:41
    $y$, equations, satisfy, solve, [8x^2-2xy^2
    • Replies: 3
    • Views: 146
    Today, 06:30 Go to last post
  3. TikZ Challenge 1

    Started by I like Serena, Yesterday 14:45
    challenge, examples, figure, make, tikz
    • Replies: 1
    • Views: 47
    Yesterday, 14:46 Go to last post
  4. Powerful equation ...

    Started by lfdahl, August 21st, 2017 16:26
    equation, find, natural, numbers, powerful
    • Replies: 0
    • Views: 45
    August 21st, 2017, 16:26 Go to last post
  5. Calculate the integral

    Started by lfdahl, August 19th, 2017 15:35
    calculate, cot, integral, int_0^fracpi4lefttan, rightleft
    • Replies: 4
    • Views: 142
    August 21st, 2017, 13:11 Go to last post
  6. Evaluate the product

    Started by lfdahl, August 17th, 2017 14:50
    2 Pages
    1 2
    $r_3$, cdot, evaluate, function, product
    • Replies: 10
    • Views: 261
    August 20th, 2017, 08:56 Go to last post
  7. Find the minimum

    Started by lfdahl, August 11th, 2017 14:58
    $b^4+c^4, expression, find, fraca^24.$, minimum
    • Replies: 2
    • Views: 123
    August 12th, 2017, 14:26 Go to last post
  8. Sequence challenge

    Started by lfdahl, August 11th, 2017 09:14
    $a_1, $a_2017$, challenge, find, sequence
    • Replies: 4
    • Views: 124
    August 12th, 2017, 14:06 Go to last post
  9. The perfect number

    Started by lfdahl, August 7th, 2017 16:47
    $n$, number, odd, perfect, prove
    • Replies: 3
    • Views: 121
    August 11th, 2017, 09:00 Go to last post
  10. Find the minimal value

    Started by lfdahl, August 7th, 2017 15:13
    expression, find, frac11+x_2017, minimal, [frac11+x_1+frac11+x_2+
    • Replies: 2
    • Views: 98
    August 8th, 2017, 16:05 Go to last post
  11. No more inequalities -

    Started by lfdahl, August 2nd, 2017 16:36
    $sum_i=1^na_i, 2n-1a_n^2, constraint, prove, [a_1^2+3a_2^2+5a_3^2+
    • Replies: 8
    • Views: 273
    August 7th, 2017, 17:33 Go to last post
  12. true or false statement

    Started by Albert, August 6th, 2017 21:19
    false, find, make, statement, true
    • Replies: 4
    • Views: 127
    August 7th, 2017, 09:53 Go to last post
  13. find value

    Started by Albert, August 6th, 2017 04:03
    $$sum_1^99dfrac, $sum_1^99dfrac, 2k+1+sqrtkk+1sqrt, find, k+sqrtk+1$
    • Replies: 1
    • Views: 86
    August 6th, 2017, 10:30 Go to last post
  14. Prove the gcd inequality

    Started by lfdahl, August 1st, 2017 15:26
    $m$, frac2absqrtb-a], natural, numbers, prove
    • Replies: 2
    • Views: 122
    August 4th, 2017, 16:52 Go to last post
  15. Fraction inequality

    Started by lfdahl, July 31st, 2017 17:43
    • Replies: 3
    • Views: 158
    August 3rd, 2017, 17:11 Go to last post
  16. Find all natural numbers ...

    Started by lfdahl, August 1st, 2017 15:10
    2 Pages
    1 2
    4_n, integer, times], underbrace4, [sqrt1
    • Replies: 11
    • Views: 278
    August 3rd, 2017, 13:29 Go to last post
  17. construct segments

    Started by Albert, July 26th, 2017 21:22
    • Replies: 7
    • Views: 219
    July 31st, 2017, 12:54 Go to last post
  18. find n

    Started by Albert, July 27th, 2017 22:24
    $a=108.5^n+147.5^n, $all, $for, find, nin
    • Replies: 2
    • Views: 159
    July 29th, 2017, 11:41 Go to last post
  19. Prove the equality

    Started by lfdahl, July 26th, 2017 13:56
    equality, equation, integer, prove, solutions
    • Replies: 4
    • Views: 190
    July 28th, 2017, 15:35 Go to last post
  20. Definite integral challenge

    Started by lfdahl, July 23rd, 2017 16:48
    calculate, challenge, definite, integral, trigonometric
    • Replies: 3
    • Views: 190
    July 28th, 2017, 05:39 Go to last post
  21. Inequality - find the largest value

    Started by lfdahl, July 25th, 2017 17:34
    a+b+c+d^2, find, inequality, largest, obey
    • Replies: 7
    • Views: 220
    July 27th, 2017, 13:45 Go to last post
  22. Prove the limit

    Started by lfdahl, July 8th, 2017 00:58
    a_n, infty, plane, prove, [lim_nrightarrow
    • Replies: 8
    • Views: 295
    July 25th, 2017, 11:38 Go to last post
  23. Prove the trig inequality

    Started by lfdahl, July 23rd, 2017 14:48
    2geq, frac11+sin, fracalpha, prove
    • Replies: 4
    • Views: 115
    July 23rd, 2017, 16:15 Go to last post
  24. Find the minimal value

    Started by lfdahl, July 21st, 2017 17:54
    $|a^cc, find, minimal, positive, satisfying
    • Replies: 4
    • Views: 158
    July 23rd, 2017, 14:20 Go to last post
  25. Find Angle DBC=?

    Started by Albert, July 18th, 2017 07:59
    • Replies: 2
    • Views: 121
    July 23rd, 2017, 09:52 Go to last post
  26. find y

    Started by Albert, May 21st, 2017 12:28
    $y$, decimal, find, integer, part
    • Replies: 2
    • Views: 179
    July 22nd, 2017, 12:40 Go to last post
  27. Prime number challenge

    Started by lfdahl, July 21st, 2017 13:29
    2015, challenge, number, prime, set
    • Replies: 3
    • Views: 151
    July 21st, 2017, 22:43 Go to last post
  28. express A with n

    Started by Albert, July 21st, 2017 11:37
    2n+1times, 5times, 7times, express, nin
    • Replies: 2
    • Views: 126
    July 21st, 2017, 21:50 Go to last post
  29. Solve the cubic equation

    Started by lfdahl, July 20th, 2017 16:05
    cubic, equation, sinh, solve, substitution
    • Replies: 2
    • Views: 117
    July 21st, 2017, 10:45 Go to last post
  30. Challenge: Is cos(pi/60) transcendental?

    Started by Prove It, July 18th, 2017 07:55
    challenge, exact, fracpi60, surd, transcendental
    • Replies: 1
    • Views: 119
    July 18th, 2017, 16:54 Go to last post

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