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Problems


IDDescription / TitleSolved By
201
Subsets with a unique sum
1142
202
Laserbeam
1307
203
Squarefree Binomial Coefficients
4689
204
Generalised Hamming Numbers
3857
205
Dice Game
7394
206
Concealed Square
10674
207
Integer partition equations
2611
208
Robot Walks
922
209
Circular Logic
1376
210
Obtuse Angled Triangles
921
211
Divisor Square Sum
1986
212
Combined Volume of Cuboids
782
213
Flea Circus
1185
214
Totient Chains
2738
215
Crack-free Walls
2005
216
Investigating the primality of numbers of the form 2n2-1
2087
217
Balanced Numbers
810
218
Perfect right-angled triangles
1616
219
Skew-cost coding
838
220
Heighway Dragon
1377
221
Alexandrian Integers
1116
222
Sphere Packing
1155
223
Almost right-angled triangles I
761
224
Almost right-angled triangles II
645
225
Tribonacci non-divisors
2326
226
A Scoop of Blancmange
1020
227
The Chase
1087
228
Minkowski Sums
797
229
Four Representations using Squares
809
230
Fibonacci Words
1685
231
The prime factorisation of binomial coefficients
2904
232
The Race
952
233
Lattice points on a circle
946
234
Semidivisible numbers
1930
235
An Arithmetic Geometric sequence
2920
236
Luxury Hampers
571
237
Tours on a 4 x n playing board
863
238
Infinite string tour
596
239
Twenty-two Foolish Primes
1024
240
Top Dice
1234
241
Perfection Quotients
537
242
Odd Triplets
618
243
Resilience
3772
244
Sliders
745
245
Coresilience
494
246
Tangents to an ellipse
494
247
Squares under a hyperbola
845
248
Numbers for which Euler’s totient function equals 13!
706
249
Prime Subset Sums
1260
250
250250
1426