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Problems Archives

The problems archives table shows problems 1 to 632. 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
9260
102Triangle containment
18409
103Special subset sums: optimum
6508
104Pandigital Fibonacci ends
13698
105Special subset sums: testing
6518
106Special subset sums: meta-testing
5199
107Minimal network
9184
108Diophantine reciprocals I
10696
109Darts
6686
110Diophantine reciprocals II
6719
111Primes with runs
5916
112Bouncy numbers
20842
113Non-bouncy numbers
9297
114Counting block combinations I
9037
115Counting block combinations II
8262
116Red, green or blue tiles
10109
117Red, green, and blue tiles
9270
118Pandigital prime sets
5647
119Digit power sum
10317
120Square remainders
11688
121Disc game prize fund
8099
122Efficient exponentiation
6414
123Prime square remainders
9716
124Ordered radicals
11717
125Palindromic sums
11456
126Cuboid layers
3783
127abc-hits
5078
128Hexagonal tile differences
4048
129Repunit divisibility
5194
130Composites with prime repunit property
4889
131Prime cube partnership
6119
132Large repunit factors
5257
133Repunit nonfactors
4541
134Prime pair connection
5783
135Same differences
5250
136Singleton difference
4605
137Fibonacci golden nuggets
4458
138Special isosceles triangles
4765
139Pythagorean tiles
4594
140Modified Fibonacci golden nuggets
3469
141Investigating progressive numbers, n, which are also square
3128
142Perfect Square Collection
4817
143Investigating the Torricelli point of a triangle
2145
144Investigating multiple reflections of a laser beam
5087
145How many reversible numbers are there below one-billion?
13987
146Investigating a Prime Pattern
4102
147Rectangles in cross-hatched grids
2411
148Exploring Pascal's triangle
4209
149Searching for a maximum-sum subsequence
3991
150Searching a triangular array for a sub-triangle having minimum-sum
3243