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## Problems Archives

The problems archives table shows problems 1 to 751. 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
11286
102Triangle containment
21748
103Special subset sums: optimum
7864
104Pandigital Fibonacci ends
15994
105Special subset sums: testing
7856
106Special subset sums: meta-testing
6247
107Minimal network
10792
108Diophantine reciprocals I
12443
109Darts
7964
110Diophantine reciprocals II
7910
111Primes with runs
7042
112Bouncy numbers
24387
113Non-bouncy numbers
10886
114Counting block combinations I
10631
115Counting block combinations II
9702
116Red, green or blue tiles
11905
117Red, green, and blue tiles
10912
118Pandigital prime sets
6760
119Digit power sum
12176
120Square remainders
13592
121Disc game prize fund
9536
122Efficient exponentiation
7615
123Prime square remainders
11360
13506
125Palindromic sums
13318
126Cuboid layers
4572
127abc-hits
6050
128Hexagonal tile differences
4852
129Repunit divisibility
6106
130Composites with prime repunit property
5745
131Prime cube partnership
7180
132Large repunit factors
6167
133Repunit nonfactors
5354
134Prime pair connection
6800
135Same differences
6208
136Singleton difference
5487
137Fibonacci golden nuggets
5333
138Special isosceles triangles
5643
139Pythagorean tiles
5443
140Modified Fibonacci golden nuggets
4192
141Investigating progressive numbers, n, which are also square
3787
142Perfect Square Collection
5634
143Investigating the Torricelli point of a triangle
2635
144Investigating multiple reflections of a laser beam
6059
145How many reversible numbers are there below one-billion?
16408
146Investigating a Prime Pattern
4874
147Rectangles in cross-hatched grids
2914
148Exploring Pascal's triangle
4977
149Searching for a maximum-sum subsequence
4691
150Searching a triangular array for a sub-triangle having minimum-sum
3829