RSS FeedDo not use secure connection

Problems


IDDescription / TitleSolved By
101Optimum polynomial
5474
102Triangle containment
11508
103Special subset sums: optimum
4013
104Pandigital Fibonacci ends
8787
105Special subset sums: testing
4069
106Special subset sums: meta-testing
3227
107Minimal network
5784
108Diophantine reciprocals I
7124
109Darts
4144
110Diophantine reciprocals II
4497
111Primes with runs
3800
112Bouncy numbers
13063
113Non-bouncy numbers
6146
114Counting block combinations I
5717
115Counting block combinations II
5249
116Red, green or blue tiles
6332
117Red, green, and blue tiles
5832
118Pandigital prime sets
3486
119Digit power sum
6482
120Square remainders
7576
121Disc game prize fund
5109
122Efficient exponentiation
4051
123Prime square remainders
6423
124Ordered radicals
7888
125Palindromic sums
7491
126Cuboid layers
2326
127abc-hits
3110
128Hexagonal tile differences
2530
129Repunit divisibility
3341
130Composites with prime repunit property
3160
131Prime cube partnership
3983
132Large repunit factors
3466
133Repunit nonfactors
2957
134Prime pair connection
3778
135Same differences
3376
136Singleton difference
2998
137Fibonacci golden nuggets
2878
138Special isosceles triangles
3158
139Pythagorean tiles
2955
140Modified Fibonacci golden nuggets
2248
141Investigating progressive numbers, n, which are also square
1959
142Perfect Square Collection
3179
143Investigating the Torricelli point of a triangle
1396
144Investigating multiple reflections of a laser beam
3117
145How many reversible numbers are there below one-billion?
8876
146Investigating a Prime Pattern
2655
147Rectangles in cross-hatched grids
1528
148Exploring Pascal's triangle
2810
149Searching for a maximum-sum subsequence
2588
150Searching a triangular array for a sub-triangle having minimum-sum
2081