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Problems


IDDescription / TitleSolved By
101Optimum polynomial
5670
102Triangle containment
11841
103Special subset sums: optimum
4138
104Pandigital Fibonacci ends
9038
105Special subset sums: testing
4203
106Special subset sums: meta-testing
3339
107Minimal network
5989
108Diophantine reciprocals I
7321
109Darts
4291
110Diophantine reciprocals II
4616
111Primes with runs
3911
112Bouncy numbers
13457
113Non-bouncy numbers
6300
114Counting block combinations I
5902
115Counting block combinations II
5415
116Red, green or blue tiles
6543
117Red, green, and blue tiles
6025
118Pandigital prime sets
3600
119Digit power sum
6696
120Square remainders
7799
121Disc game prize fund
5280
122Efficient exponentiation
4184
123Prime square remainders
6606
124Ordered radicals
8104
125Palindromic sums
7688
126Cuboid layers
2399
127abc-hits
3216
128Hexagonal tile differences
2602
129Repunit divisibility
3449
130Composites with prime repunit property
3251
131Prime cube partnership
4107
132Large repunit factors
3566
133Repunit nonfactors
3033
134Prime pair connection
3889
135Same differences
3467
136Singleton difference
3072
137Fibonacci golden nuggets
2945
138Special isosceles triangles
3234
139Pythagorean tiles
3032
140Modified Fibonacci golden nuggets
2314
141Investigating progressive numbers, n, which are also square
2025
142Perfect Square Collection
3264
143Investigating the Torricelli point of a triangle
1434
144Investigating multiple reflections of a laser beam
3215
145How many reversible numbers are there below one-billion?
9098
146Investigating a Prime Pattern
2739
147Rectangles in cross-hatched grids
1562
148Exploring Pascal's triangle
2885
149Searching for a maximum-sum subsequence
2659
150Searching a triangular array for a sub-triangle having minimum-sum
2133