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Problems


IDDescription / TitleSolved By
201Subsets with a unique sum
1278
202Laserbeam
1477
203Squarefree Binomial Coefficients
5392
204Generalised Hamming Numbers
4409
205Dice Game
8476
206Concealed Square
12293
207Integer partition equations
2914
208Robot Walks
1007
209Circular Logic
1553
210Obtuse Angled Triangles
1016
211Divisor Square Sum
2341
212Combined Volume of Cuboids
876
213Flea Circus
1384
214Totient Chains
3153
215Crack-free Walls
2250
216Investigating the primality of numbers of the form 2n2-1
2373
217Balanced Numbers
870
218Perfect right-angled triangles
1836
219Skew-cost coding
918
220Heighway Dragon
1517
221Alexandrian Integers
1254
222Sphere Packing
1283
223Almost right-angled triangles I
840
224Almost right-angled triangles II
735
225Tribonacci non-divisors
2672
226A Scoop of Blancmange
1110
227The Chase
1235
228Minkowski Sums
869
229Four Representations using Squares
915
230Fibonacci Words
1841
231The prime factorisation of binomial coefficients
3326
232The Race
1050
233Lattice points on a circle
1158
234Semidivisible numbers
2118
235An Arithmetic Geometric sequence
3288
236Luxury Hampers
627
237Tours on a 4 x n playing board
928
238Infinite string tour
648
239Twenty-two Foolish Primes
1117
240Top Dice
1370
241Perfection Quotients
554
242Odd Triplets
678
243Resilience
5011
244Sliders
798
245Coresilience
505
246Tangents to an ellipse
492
247Squares under a hyperbola
896
248Numbers for which Euler’s totient function equals 13!
770
249Prime Subset Sums
1439
250250250
1670