Cache update: 18 minutes

Problems Archives

The problems archives table shows problems 1 to 667. 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
9797
102Triangle containment
19376
103Special subset sums: optimum
6852
104Pandigital Fibonacci ends
14315
105Special subset sums: testing
6841
106Special subset sums: meta-testing
5443
107Minimal network
9604
108Diophantine reciprocals I
11171
109Darts
7007
110Diophantine reciprocals II
7028
111Primes with runs
6186
112Bouncy numbers
21886
113Non-bouncy numbers
9707
114Counting block combinations I
9451
115Counting block combinations II
8630
116Red, green or blue tiles
10616
117Red, green, and blue tiles
9725
118Pandigital prime sets
5907
119Digit power sum
10831
120Square remainders
12242
121Disc game prize fund
8486
122Efficient exponentiation
6739
123Prime square remainders
10168
124Ordered radicals
12197
125Palindromic sums
11955
126Cuboid layers
3993
127abc-hits
5339
128Hexagonal tile differences
4251
129Repunit divisibility
5431
130Composites with prime repunit property
5108
131Prime cube partnership
6380
132Large repunit factors
5486
133Repunit nonfactors
4751
134Prime pair connection
6040
135Same differences
5503
136Singleton difference
4819
137Fibonacci golden nuggets
4666
138Special isosceles triangles
4998
139Pythagorean tiles
4818
140Modified Fibonacci golden nuggets
3658
141Investigating progressive numbers, n, which are also square
3295
142Perfect Square Collection
5031
143Investigating the Torricelli point of a triangle
2279
144Investigating multiple reflections of a laser beam
5361
145How many reversible numbers are there below one-billion?
14738
146Investigating a Prime Pattern
4293
147Rectangles in cross-hatched grids
2550
148Exploring Pascal's triangle
4409
149Searching for a maximum-sum subsequence
4180
150Searching a triangular array for a sub-triangle having minimum-sum
3410