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Index to Nick's Mathematical Puzzles

  1. Folded sheet of paper
  2. Triangular area
  3. Two logicians
  4. Equatorial belt
  5. Confused bank teller
  6. Ant on a box
  7. Five men, a monkey, and some coconuts
  8. 271
  9. Reciprocals and cubes
  10. Farmer's enclosure
  11. Dice game
  12. Making $1
  13. Coin triplets
  14. Two ladders in an alley
  15. Infinite product
  16. Zero-sum game
  17. Three children
  18. One extra coin
  19. Five card trick
  20. Five card trick, part 2
  21. Birthday line
  22. Isosceles angle
  23. Length of hypotenuse
  24. Die: median throws
  25. Die: mean throws
  26. Two packs of cards
  27. 1000th digit
  28. Making 24
  29. xx
  30. Two pool balls
  31. Area of a rhombus
  32. Differentiation conundrum
  33. Harmonic sum
  34. Harmonic sum 2
  35. Cuboids
  36. Composite numbers
  37. Five marbles
  38. Twelve marbles
  39. Prime or composite?
  40. No consecutive heads
  41. Crazy dice
  42. Multiplicative sequence
  43. Sum of two powers
  44. Sum of two powers 2
  45. Area of regular 2n-gon
  46. Consecutive subsequence
  47. 1000 divisors
  48. Exponential equation
  49. An odd polynomial
  50. Highest score
  51. Greatest common divisor
  52. Floor function sum
  53. The absentminded professor
  54. Diophantine squares
  55. Area of a trapezoid
  56. Partition identity
  57. Binomial coefficient divisibility
  58. Fifth power plus five
  59. Triangle inequality
  60. Sum of reciprocals
  61. Two cubes?
  62. Four squares on a quadrilateral
  63. Cyclic hexagon
  64. Balls in an urn
  65. Consecutive integer products
  66. Quadratic divisibility
  67. Random number generator
  68. Difference of powers
  69. Combinatorial sum
  70. One degree
  71. Consecutive cubes and squares
  72. Depleted harmonic series
  73. Unobtuse triangle
  74. Sum of 9999 consecutive squares
  75. Car journey
  76. Square inscribed in a triangle
  77. Minimal straight cut
  78. Perfect square
  79. Sum of fourth powers
  80. Sixes and sevens
  81. Digit transfer
  82. Consecutive heads
  83. Divisibility
  84. Missing digits
  85. Fibonacci nines
  86. Folded card
  87. 2004
  88. Nested radicals
  89. Square digits
  90. Powers of 2: rearranged digits
  91. Nonagon diagonals
  92. Consecutive integer sums
  93. Pascal's triangle
  94. Square endings
  95. Integer polynomial
  96. Five real numbers
  97. Two squares
  98. Three powers
  99. Two similar triangles
  100. Perpendicular medians
  101. Right triangles
  102. Almost exponential
  103. Root sums
  104. An arbitrary sum
  105. Difference of nth powers
  106. Flying cards
  107. A mysterious sequence
  108. Eyeball to eyeball
  109. Nested circular functions
  110. Pairwise products
  111. Trigonometric progression
  112. Angle bisector
  113. Ant in a field
  114. Sums of squares and cubes
  115. Sum of sines
  116. Factorial divisors
  117. Random point in an equilateral triangle
  118. Powers of 2: deleted digit
  119. Three sines
  120. Factorial plus one
  121. Integer sequence
  122. Powers of 2 and 5
  123. Right angle and median
  124. The ladder
  125. Divisibility by 446617991732222310
  126. Intersecting squares
  127. Prime number generator
  128. Modular equation
  129. Abelian group
  130. Reciprocal polynomial?
  131. Horse race
  132. Triangular angle
  133. Prime sequence?
  134. Sum of reciprocal roots
  135. Clock hands
  136. Point in a triangle
  137. Factorial plus one equals prime power?
  138. Integer sum of roots
  139. Three towns
  140. Six towns
  141. Alternating series
  142. Sum of two nth powers
  143. Semicircle in a triangle
  144. Difference of two nth powers
  145. Heads and tails
  146. Odds and evens
  147. Prime or composite 2
  148. Power series
  149. Ones and nines
  150. Isosceles apex angle
  151. Painted cubes
  152. Totient valence
  153. Semicircle in a square
  154. Triangle in a trapezoid
  155. Sum of two powers is a square?
  156. Three simultaneous equations
  157. Trigonometric product
  158. Fermat squares
  159. Eight odd squares
  160. Absolute maximum

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Nick Hobson
nickh@qbyte.org
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Last updated: August 8, 2007