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Problems Archives

The problems archives table shows problems 1 to 713. 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
10628
102Triangle containment
20777
103Special subset sums: optimum
7404
104Pandigital Fibonacci ends
15310
105Special subset sums: testing
7406
106Special subset sums: meta-testing
5884
107Minimal network
10269
108Diophantine reciprocals I
11891
109Darts
7548
110Diophantine reciprocals II
7528
111Primes with runs
6651
112Bouncy numbers
23427
113Non-bouncy numbers
10396
114Counting block combinations I
10128
115Counting block combinations II
9246
116Red, green or blue tiles
11364
117Red, green, and blue tiles
10418
118Pandigital prime sets
6361
119Digit power sum
11605
120Square remainders
13001
121Disc game prize fund
9070
122Efficient exponentiation
7197
123Prime square remainders
10836
124Ordered radicals
12920
125Palindromic sums
12726
126Cuboid layers
4302
127abc-hits
5705
128Hexagonal tile differences
4569
129Repunit divisibility
5783
130Composites with prime repunit property
5441
131Prime cube partnership
6803
132Large repunit factors
5847
133Repunit nonfactors
5057
134Prime pair connection
6454
135Same differences
5866
136Singleton difference
5158
137Fibonacci golden nuggets
5024
138Special isosceles triangles
5333
139Pythagorean tiles
5155
140Modified Fibonacci golden nuggets
3943
141Investigating progressive numbers, n, which are also square
3538
142Perfect Square Collection
5361
143Investigating the Torricelli point of a triangle
2482
144Investigating multiple reflections of a laser beam
5741
145How many reversible numbers are there below one-billion?
15755
146Investigating a Prime Pattern
4603
147Rectangles in cross-hatched grids
2736
148Exploring Pascal's triangle
4724
149Searching for a maximum-sum subsequence
4450
150Searching a triangular array for a sub-triangle having minimum-sum
3635