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Problems


IDDescription / TitleSolved By
101Optimum polynomial
5461
102Triangle containment
11471
103Special subset sums: optimum
3995
104Pandigital Fibonacci ends
8758
105Special subset sums: testing
4051
106Special subset sums: meta-testing
3218
107Minimal network
5765
108Diophantine reciprocals I
7099
109Darts
4127
110Diophantine reciprocals II
4488
111Primes with runs
3789
112Bouncy numbers
13021
113Non-bouncy numbers
6130
114Counting block combinations I
5697
115Counting block combinations II
5230
116Red, green or blue tiles
6311
117Red, green, and blue tiles
5811
118Pandigital prime sets
3471
119Digit power sum
6458
120Square remainders
7546
121Disc game prize fund
5088
122Efficient exponentiation
4037
123Prime square remainders
6402
124Ordered radicals
7862
125Palindromic sums
7464
126Cuboid layers
2313
127abc-hits
3094
128Hexagonal tile differences
2518
129Repunit divisibility
3329
130Composites with prime repunit property
3147
131Prime cube partnership
3964
132Large repunit factors
3455
133Repunit nonfactors
2941
134Prime pair connection
3760
135Same differences
3370
136Singleton difference
2990
137Fibonacci golden nuggets
2865
138Special isosceles triangles
3146
139Pythagorean tiles
2947
140Modified Fibonacci golden nuggets
2242
141Investigating progressive numbers, n, which are also square
1952
142Perfect Square Collection
3172
143Investigating the Torricelli point of a triangle
1389
144Investigating multiple reflections of a laser beam
3105
145How many reversible numbers are there below one-billion?
8838
146Investigating a Prime Pattern
2643
147Rectangles in cross-hatched grids
1522
148Exploring Pascal's triangle
2795
149Searching for a maximum-sum subsequence
2577
150Searching a triangular array for a sub-triangle having minimum-sum
2075