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Problems Archives

The problems archives table shows problems 1 to 745. 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.


ID

Description / TitleSolved By
101Optimum polynomial
11145
102Triangle containment
21541
103Special subset sums: optimum
7765
104Pandigital Fibonacci ends
15877
105Special subset sums: testing
7764
106Special subset sums: meta-testing
6173
107Minimal network
10685
108Diophantine reciprocals I
12324
109Darts
7884
110Diophantine reciprocals II
7825
111Primes with runs
6955
112Bouncy numbers
24193
113Non-bouncy numbers
10775
114Counting block combinations I
10524
115Counting block combinations II
9608
116Red, green or blue tiles
11781
117Red, green, and blue tiles
10807
118Pandigital prime sets
6684
119Digit power sum
12057
120Square remainders
13464
121Disc game prize fund
9429
122Efficient exponentiation
7506
123Prime square remainders
11242
124Ordered radicals
13372
125Palindromic sums
13197
126Cuboid layers
4503
127abc-hits
5971
128Hexagonal tile differences
4786
129Repunit divisibility
6042
130Composites with prime repunit property
5675
131Prime cube partnership
7090
132Large repunit factors
6100
133Repunit nonfactors
5296
134Prime pair connection
6717
135Same differences
6123
136Singleton difference
5404
137Fibonacci golden nuggets
5262
138Special isosceles triangles
5576
139Pythagorean tiles
5387
140Modified Fibonacci golden nuggets
4141
141Investigating progressive numbers, n, which are also square
3737
142Perfect Square Collection
5576
143Investigating the Torricelli point of a triangle
2600
144Investigating multiple reflections of a laser beam
5991
145How many reversible numbers are there below one-billion?
16266
146Investigating a Prime Pattern
4816
147Rectangles in cross-hatched grids
2876
148Exploring Pascal's triangle
4922
149Searching for a maximum-sum subsequence
4643
150Searching a triangular array for a sub-triangle having minimum-sum
3785