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Problems Archives

The problems archives table shows problems 1 to 679. 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
10063
102Triangle containment
19792
103Special subset sums: optimum
7023
104Pandigital Fibonacci ends
14618
105Special subset sums: testing
7019
106Special subset sums: meta-testing
5579
107Minimal network
9823
108Diophantine reciprocals I
11402
109Darts
7164
110Diophantine reciprocals II
7182
111Primes with runs
6334
112Bouncy numbers
22379
113Non-bouncy numbers
9925
114Counting block combinations I
9690
115Counting block combinations II
8846
116Red, green or blue tiles
10853
117Red, green, and blue tiles
9955
118Pandigital prime sets
6054
119Digit power sum
11071
120Square remainders
12452
121Disc game prize fund
8661
122Efficient exponentiation
6873
123Prime square remainders
10375
124Ordered radicals
12423
125Palindromic sums
12196
126Cuboid layers
4093
127abc-hits
5460
128Hexagonal tile differences
4343
129Repunit divisibility
5528
130Composites with prime repunit property
5201
131Prime cube partnership
6519
132Large repunit factors
5591
133Repunit nonfactors
4848
134Prime pair connection
6166
135Same differences
5612
136Singleton difference
4919
137Fibonacci golden nuggets
4772
138Special isosceles triangles
5091
139Pythagorean tiles
4932
140Modified Fibonacci golden nuggets
3736
141Investigating progressive numbers, n, which are also square
3372
142Perfect Square Collection
5125
143Investigating the Torricelli point of a triangle
2339
144Investigating multiple reflections of a laser beam
5489
145How many reversible numbers are there below one-billion?
15069
146Investigating a Prime Pattern
4373
147Rectangles in cross-hatched grids
2612
148Exploring Pascal's triangle
4509
149Searching for a maximum-sum subsequence
4259
150Searching a triangular array for a sub-triangle having minimum-sum
3478