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Problems Archives

The problems archives table shows problems 1 to 661. 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
9644
102Triangle containment
19139
103Special subset sums: optimum
6766
104Pandigital Fibonacci ends
14167
105Special subset sums: testing
6760
106Special subset sums: meta-testing
5376
107Minimal network
9485
108Diophantine reciprocals I
11049
109Darts
6928
110Diophantine reciprocals II
6949
111Primes with runs
6111
112Bouncy numbers
21649
113Non-bouncy numbers
9598
114Counting block combinations I
9341
115Counting block combinations II
8536
116Red, green or blue tiles
10485
117Red, green, and blue tiles
9606
118Pandigital prime sets
5836
119Digit power sum
10699
120Square remainders
12102
121Disc game prize fund
8391
122Efficient exponentiation
6648
123Prime square remainders
10041
124Ordered radicals
12063
125Palindromic sums
11827
126Cuboid layers
3930
127abc-hits
5269
128Hexagonal tile differences
4197
129Repunit divisibility
5367
130Composites with prime repunit property
5045
131Prime cube partnership
6313
132Large repunit factors
5421
133Repunit nonfactors
4686
134Prime pair connection
5972
135Same differences
5431
136Singleton difference
4758
137Fibonacci golden nuggets
4602
138Special isosceles triangles
4931
139Pythagorean tiles
4753
140Modified Fibonacci golden nuggets
3597
141Investigating progressive numbers, n, which are also square
3240
142Perfect Square Collection
4968
143Investigating the Torricelli point of a triangle
2238
144Investigating multiple reflections of a laser beam
5293
145How many reversible numbers are there below one-billion?
14562
146Investigating a Prime Pattern
4241
147Rectangles in cross-hatched grids
2509
148Exploring Pascal's triangle
4352
149Searching for a maximum-sum subsequence
4129
150Searching a triangular array for a sub-triangle having minimum-sum
3366