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Problems


IDDescription / TitleSolved By
201
Subsets with a unique sum
1024
202
Laserbeam
1195
203
Squarefree Binomial Coefficients
4358
204
Generalised Hamming Numbers
3577
205
Dice Game
6820
206
Concealed Square
9766
207
Integer partition equations
2413
208
Robot Walks
849
209
Circular Logic
1256
210
Obtuse Angled Triangles
837
211
Divisor Square Sum
1767
212
Combined Volume of Cuboids
737
213
Flea Circus
1096
214
Totient Chains
2496
215
Crack-free Walls
1827
216
Investigating the primality of numbers of the form 2n2-1
1921
217
Balanced Numbers
740
218
Perfect right-angled triangles
1459
219
Skew-cost coding
766
220
Heighway Dragon
1280
221
Alexandrian Integers
1025
222
Sphere Packing
1065
223
Almost right-angled triangles I
694
224
Almost right-angled triangles II
594
225
Tribonacci non-divisors
2099
226
A Scoop of Blancmange
940
227
The Chase
979
228
Minkowski Sums
739
229
Four Representations using Squares
734
230
Fibonacci Words
1564
231
The prime factorisation of binomial coefficients
2665
232
The Race
877
233
Lattice points on a circle
799
234
Semidivisible numbers
1779
235
An Arithmetic Geometric sequence
2709
236
Luxury Hampers
530
237
Tours on a 4 x n playing board
790
238
Infinite string tour
555
239
Twenty-two Foolish Primes
937
240
Top Dice
1136
241
Perfection Quotients
500
242
Odd Triplets
567
243
Resilience
3097
244
Sliders
686
245
Coresilience
455
246
Tangents to an ellipse
459
247
Squares under a hyperbola
789
248
Numbers for which Euler’s totient function equals 13!
651
249
Prime Subset Sums
1123
250
250250
1271