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Problems Archives

The problems archives table shows problems 1 to 641. 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
9401
102Triangle containment
18665
103Special subset sums: optimum
6599
104Pandigital Fibonacci ends
13850
105Special subset sums: testing
6597
106Special subset sums: meta-testing
5246
107Minimal network
9289
108Diophantine reciprocals I
10809
109Darts
6744
110Diophantine reciprocals II
6796
111Primes with runs
5981
112Bouncy numbers
21091
113Non-bouncy numbers
9385
114Counting block combinations I
9132
115Counting block combinations II
8345
116Red, green or blue tiles
10232
117Red, green, and blue tiles
9382
118Pandigital prime sets
5709
119Digit power sum
10435
120Square remainders
11814
121Disc game prize fund
8194
122Efficient exponentiation
6482
123Prime square remainders
9829
124Ordered radicals
11829
125Palindromic sums
11571
126Cuboid layers
3841
127abc-hits
5134
128Hexagonal tile differences
4094
129Repunit divisibility
5241
130Composites with prime repunit property
4932
131Prime cube partnership
6190
132Large repunit factors
5303
133Repunit nonfactors
4585
134Prime pair connection
5851
135Same differences
5307
136Singleton difference
4656
137Fibonacci golden nuggets
4503
138Special isosceles triangles
4826
139Pythagorean tiles
4650
140Modified Fibonacci golden nuggets
3513
141Investigating progressive numbers, n, which are also square
3158
142Perfect Square Collection
4864
143Investigating the Torricelli point of a triangle
2178
144Investigating multiple reflections of a laser beam
5171
145How many reversible numbers are there below one-billion?
14186
146Investigating a Prime Pattern
4147
147Rectangles in cross-hatched grids
2447
148Exploring Pascal's triangle
4256
149Searching for a maximum-sum subsequence
4041
150Searching a triangular array for a sub-triangle having minimum-sum
3287