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Problems Archives

The problems archives table shows problems 1 to 617. 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
8972
102Triangle containment
17759
103Special subset sums: optimum
6318
104Pandigital Fibonacci ends
13289
105Special subset sums: testing
6340
106Special subset sums: meta-testing
5058
107Minimal network
8935
108Diophantine reciprocals I
10396
109Darts
6467
110Diophantine reciprocals II
6544
111Primes with runs
5741
112Bouncy numbers
20098
113Non-bouncy numbers
9037
114Counting block combinations I
8748
115Counting block combinations II
8001
116Red, green or blue tiles
9789
117Red, green, and blue tiles
8979
118Pandigital prime sets
5457
119Digit power sum
9958
120Square remainders
11341
121Disc game prize fund
7864
122Efficient exponentiation
6182
123Prime square remainders
9405
124Ordered radicals
11379
125Palindromic sums
11099
126Cuboid layers
3687
127abc-hits
4909
128Hexagonal tile differences
3932
129Repunit divisibility
5038
130Composites with prime repunit property
4744
131Prime cube partnership
5942
132Large repunit factors
5102
133Repunit nonfactors
4409
134Prime pair connection
5608
135Same differences
5108
136Singleton difference
4477
137Fibonacci golden nuggets
4339
138Special isosceles triangles
4622
139Pythagorean tiles
4459
140Modified Fibonacci golden nuggets
3383
141Investigating progressive numbers, n, which are also square
3009
142Perfect Square Collection
4679
143Investigating the Torricelli point of a triangle
2074
144Investigating multiple reflections of a laser beam
4936
145How many reversible numbers are there below one-billion?
13540
146Investigating a Prime Pattern
3994
147Rectangles in cross-hatched grids
2337
148Exploring Pascal's triangle
4099
149Searching for a maximum-sum subsequence
3871
150Searching a triangular array for a sub-triangle having minimum-sum
3163