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Problems Archives

The problems archives table shows problems 1 to 621. 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
9072
102Triangle containment
17956
103Special subset sums: optimum
6375
104Pandigital Fibonacci ends
13408
105Special subset sums: testing
6396
106Special subset sums: meta-testing
5102
107Minimal network
9011
108Diophantine reciprocals I
10497
109Darts
6535
110Diophantine reciprocals II
6600
111Primes with runs
5792
112Bouncy numbers
20342
113Non-bouncy numbers
9116
114Counting block combinations I
8843
115Counting block combinations II
8086
116Red, green or blue tiles
9885
117Red, green, and blue tiles
9071
118Pandigital prime sets
5518
119Digit power sum
10087
120Square remainders
11445
121Disc game prize fund
7938
122Efficient exponentiation
6260
123Prime square remainders
9502
124Ordered radicals
11495
125Palindromic sums
11207
126Cuboid layers
3727
127abc-hits
4962
128Hexagonal tile differences
3965
129Repunit divisibility
5082
130Composites with prime repunit property
4785
131Prime cube partnership
6003
132Large repunit factors
5139
133Repunit nonfactors
4447
134Prime pair connection
5663
135Same differences
5158
136Singleton difference
4518
137Fibonacci golden nuggets
4371
138Special isosceles triangles
4655
139Pythagorean tiles
4494
140Modified Fibonacci golden nuggets
3414
141Investigating progressive numbers, n, which are also square
3044
142Perfect Square Collection
4717
143Investigating the Torricelli point of a triangle
2093
144Investigating multiple reflections of a laser beam
4986
145How many reversible numbers are there below one-billion?
13671
146Investigating a Prime Pattern
4025
147Rectangles in cross-hatched grids
2362
148Exploring Pascal's triangle
4138
149Searching for a maximum-sum subsequence
3907
150Searching a triangular array for a sub-triangle having minimum-sum
3185