Cache update: 6 minutes

Problems Archives

  • Problem 744 will be accessible in 22 hours, 41 minutes (Sunday, 24th January 2021, 01:00 am)

The problems archives table shows problems 1 to 733. 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
11022
102Triangle containment
21355
103Special subset sums: optimum
7673
104Pandigital Fibonacci ends
15731
105Special subset sums: testing
7667
106Special subset sums: meta-testing
6104
107Minimal network
10584
108Diophantine reciprocals I
12208
109Darts
7794
110Diophantine reciprocals II
7745
111Primes with runs
6886
112Bouncy numbers
24016
113Non-bouncy numbers
10666
114Counting block combinations I
10413
115Counting block combinations II
9504
116Red, green or blue tiles
11664
117Red, green, and blue tiles
10693
118Pandigital prime sets
6598
119Digit power sum
11926
120Square remainders
13350
121Disc game prize fund
9328
122Efficient exponentiation
7418
123Prime square remainders
11122
124Ordered radicals
13239
125Palindromic sums
13082
126Cuboid layers
4457
127abc-hits
5893
128Hexagonal tile differences
4729
129Repunit divisibility
5979
130Composites with prime repunit property
5616
131Prime cube partnership
7014
132Large repunit factors
6036
133Repunit nonfactors
5237
134Prime pair connection
6642
135Same differences
6049
136Singleton difference
5331
137Fibonacci golden nuggets
5201
138Special isosceles triangles
5511
139Pythagorean tiles
5318
140Modified Fibonacci golden nuggets
4089
141Investigating progressive numbers, n, which are also square
3690
142Perfect Square Collection
5529
143Investigating the Torricelli point of a triangle
2573
144Investigating multiple reflections of a laser beam
5920
145How many reversible numbers are there below one-billion?
16148
146Investigating a Prime Pattern
4752
147Rectangles in cross-hatched grids
2847
148Exploring Pascal's triangle
4874
149Searching for a maximum-sum subsequence
4591
150Searching a triangular array for a sub-triangle having minimum-sum
3752