RSS FeedUse secure connection

Problems


IDDescription / TitleSolved By
101
Optimum polynomial
4670
102
Triangle containment
10048
103
Special subset sums: optimum
3456
104
Pandigital Fibonacci ends
7641
105
Special subset sums: testing
3503
106
Special subset sums: meta-testing
2792
107
Minimal network
4981
108
Diophantine reciprocals I
6287
109
Darts
3512
110
Diophantine reciprocals II
3964
111
Primes with runs
3297
112
Bouncy numbers
11394
113
Non-bouncy numbers
5425
114
Counting block combinations I
4969
115
Counting block combinations II
4542
116
Red, green or blue tiles
5497
117
Red, green, and blue tiles
5083
118
Pandigital prime sets
3004
119
Digit power sum
5572
120
Square remainders
6605
121
Disc game prize fund
4345
122
Efficient exponentiation
3557
123
Prime square remainders
5632
124
Ordered radicals
6948
125
Palindromic sums
6581
126
Cuboid layers
2010
127
abc-hits
2684
128
Hexagonal tile differences
2169
129
Repunit divisibility
2918
130
Composites with prime repunit property
2755
131
Prime cube partnership
3494
132
Large repunit factors
3061
133
Repunit nonfactors
2621
134
Prime pair connection
3259
135
Same differences
2947
136
Singleton difference
2636
137
Fibonacci golden nuggets
2525
138
Special isosceles triangles
2792
139
Pythagorean tiles
2594
140
Modified Fibonacci golden nuggets
1967
141
Investigating progressive numbers, n, which are also square.
1704
142
Perfect Square Collection
2808
143
Investigating the Torricelli point of a triangle
1243
144
Investigating multiple reflections of a laser beam.
2553
145
How many reversible numbers are there below one-billion?
7873
146
Investigating a Prime Pattern
2352
147
Rectangles in cross-hatched grids
1369
148
Exploring Pascal's triangle.
2492
149
Searching for a maximum-sum subsequence.
2273
150
Searching a triangular array for a sub-triangle having minimum-sum.
1845