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Problems


IDDescription / TitleSolved By
101Optimum polynomial
5676
102Triangle containment
11865
103Special subset sums: optimum
4128
104Pandigital Fibonacci ends
9055
105Special subset sums: testing
4194
106Special subset sums: meta-testing
3326
107Minimal network
5981
108Diophantine reciprocals I
7325
109Darts
4283
110Diophantine reciprocals II
4609
111Primes with runs
3902
112Bouncy numbers
13502
113Non-bouncy numbers
6301
114Counting block combinations I
5902
115Counting block combinations II
5412
116Red, green or blue tiles
6546
117Red, green, and blue tiles
6026
118Pandigital prime sets
3580
119Digit power sum
6697
120Square remainders
7818
121Disc game prize fund
5270
122Efficient exponentiation
4176
123Prime square remainders
6608
124Ordered radicals
8112
125Palindromic sums
7683
126Cuboid layers
2381
127abc-hits
3216
128Hexagonal tile differences
2589
129Repunit divisibility
3435
130Composites with prime repunit property
3237
131Prime cube partnership
4090
132Large repunit factors
3545
133Repunit nonfactors
3015
134Prime pair connection
3867
135Same differences
3451
136Singleton difference
3058
137Fibonacci golden nuggets
2924
138Special isosceles triangles
3219
139Pythagorean tiles
3019
140Modified Fibonacci golden nuggets
2285
141Investigating progressive numbers, n, which are also square
2005
142Perfect Square Collection
3244
143Investigating the Torricelli point of a triangle
1404
144Investigating multiple reflections of a laser beam
3194
145How many reversible numbers are there below one-billion?
9092
146Investigating a Prime Pattern
2716
147Rectangles in cross-hatched grids
1536
148Exploring Pascal's triangle
2862
149Searching for a maximum-sum subsequence
2637
150Searching a triangular array for a sub-triangle having minimum-sum
2117