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Problems Archives

The problems archives table shows problems 1 to 652. 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
9533
102Triangle containment
18915
103Special subset sums: optimum
6688
104Pandigital Fibonacci ends
14018
105Special subset sums: testing
6685
106Special subset sums: meta-testing
5319
107Minimal network
9402
108Diophantine reciprocals I
10929
109Darts
6857
110Diophantine reciprocals II
6883
111Primes with runs
6053
112Bouncy numbers
21388
113Non-bouncy numbers
9504
114Counting block combinations I
9240
115Counting block combinations II
8448
116Red, green or blue tiles
10357
117Red, green, and blue tiles
9494
118Pandigital prime sets
5782
119Digit power sum
10581
120Square remainders
11974
121Disc game prize fund
8310
122Efficient exponentiation
6581
123Prime square remainders
9955
124Ordered radicals
11951
125Palindromic sums
11707
126Cuboid layers
3889
127abc-hits
5204
128Hexagonal tile differences
4152
129Repunit divisibility
5309
130Composites with prime repunit property
4996
131Prime cube partnership
6265
132Large repunit factors
5371
133Repunit nonfactors
4648
134Prime pair connection
5916
135Same differences
5377
136Singleton difference
4713
137Fibonacci golden nuggets
4557
138Special isosceles triangles
4883
139Pythagorean tiles
4705
140Modified Fibonacci golden nuggets
3566
141Investigating progressive numbers, n, which are also square
3203
142Perfect Square Collection
4923
143Investigating the Torricelli point of a triangle
2213
144Investigating multiple reflections of a laser beam
5239
145How many reversible numbers are there below one-billion?
14384
146Investigating a Prime Pattern
4202
147Rectangles in cross-hatched grids
2475
148Exploring Pascal's triangle
4316
149Searching for a maximum-sum subsequence
4085
150Searching a triangular array for a sub-triangle having minimum-sum
3328