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Problems Archives

  • Problem 731 will be accessible in 7 hours, 21 minutes (Sunday, 25th October 2020, 10:00 am)

The problems archives table shows problems 1 to 720. 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.


ID

Description / TitleSolved By
101Optimum polynomial
10861
102Triangle containment
21138
103Special subset sums: optimum
7559
104Pandigital Fibonacci ends
15572
105Special subset sums: testing
7563
106Special subset sums: meta-testing
6014
107Minimal network
10458
108Diophantine reciprocals I
12098
109Darts
7690
110Diophantine reciprocals II
7666
111Primes with runs
6790
112Bouncy numbers
23806
113Non-bouncy numbers
10561
114Counting block combinations I
10302
115Counting block combinations II
9398
116Red, green or blue tiles
11550
117Red, green, and blue tiles
10591
118Pandigital prime sets
6502
119Digit power sum
11804
120Square remainders
13212
121Disc game prize fund
9216
122Efficient exponentiation
7332
123Prime square remainders
11015
124Ordered radicals
13112
125Palindromic sums
12944
126Cuboid layers
4404
127abc-hits
5822
128Hexagonal tile differences
4669
129Repunit divisibility
5892
130Composites with prime repunit property
5541
131Prime cube partnership
6927
132Large repunit factors
5951
133Repunit nonfactors
5158
134Prime pair connection
6568
135Same differences
5971
136Singleton difference
5256
137Fibonacci golden nuggets
5123
138Special isosceles triangles
5436
139Pythagorean tiles
5253
140Modified Fibonacci golden nuggets
4021
141Investigating progressive numbers, n, which are also square
3624
142Perfect Square Collection
5461
143Investigating the Torricelli point of a triangle
2538
144Investigating multiple reflections of a laser beam
5842
145How many reversible numbers are there below one-billion?
15991
146Investigating a Prime Pattern
4688
147Rectangles in cross-hatched grids
2801
148Exploring Pascal's triangle
4806
149Searching for a maximum-sum subsequence
4535
150Searching a triangular array for a sub-triangle having minimum-sum
3702