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Problems Archives

  • Problem 637 will be accessible in 6 hours (Sunday, 23rd September 2018, 01:00 am)

The problems archives table shows problems 1 to 626. If you would like to tackle the 10 most recently published problems then go to Recent problems.
Click the description/title of the problem to view details and submit your answer.


IDDescription / TitleSolved By
101Optimum polynomial
9173
102Triangle containment
18209
103Special subset sums: optimum
6445
104Pandigital Fibonacci ends
13560
105Special subset sums: testing
6453
106Special subset sums: meta-testing
5142
107Minimal network
9108
108Diophantine reciprocals I
10601
109Darts
6610
110Diophantine reciprocals II
6662
111Primes with runs
5854
112Bouncy numbers
20614
113Non-bouncy numbers
9212
114Counting block combinations I
8951
115Counting block combinations II
8181
116Red, green or blue tiles
10010
117Red, green, and blue tiles
9178
118Pandigital prime sets
5578
119Digit power sum
10204
120Square remainders
11579
121Disc game prize fund
8014
122Efficient exponentiation
6350
123Prime square remainders
9615
124Ordered radicals
11621
125Palindromic sums
11337
126Cuboid layers
3758
127abc-hits
5025
128Hexagonal tile differences
4009
129Repunit divisibility
5141
130Composites with prime repunit property
4838
131Prime cube partnership
6059
132Large repunit factors
5206
133Repunit nonfactors
4500
134Prime pair connection
5729
135Same differences
5198
136Singleton difference
4556
137Fibonacci golden nuggets
4422
138Special isosceles triangles
4714
139Pythagorean tiles
4549
140Modified Fibonacci golden nuggets
3442
141Investigating progressive numbers, n, which are also square
3083
142Perfect Square Collection
4773
143Investigating the Torricelli point of a triangle
2122
144Investigating multiple reflections of a laser beam
5040
145How many reversible numbers are there below one-billion?
13846
146Investigating a Prime Pattern
4067
147Rectangles in cross-hatched grids
2386
148Exploring Pascal's triangle
4180
149Searching for a maximum-sum subsequence
3956
150Searching a triangular array for a sub-triangle having minimum-sum
3223