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Problems


IDDescription / TitleSolved By
201Subsets with a unique sum
1313
202Laserbeam
1511
203Squarefree Binomial Coefficients
5376
204Generalised Hamming Numbers
4440
205Dice Game
8499
206Concealed Square
12309
207Integer partition equations
2947
208Robot Walks
1040
209Circular Logic
1553
210Obtuse Angled Triangles
1051
211Divisor Square Sum
2373
212Combined Volume of Cuboids
876
213Flea Circus
1384
214Totient Chains
3178
215Crack-free Walls
2281
216Investigating the primality of numbers of the form 2n2-1
2402
217Balanced Numbers
905
218Perfect right-angled triangles
1873
219Skew-cost coding
952
220Heighway Dragon
1517
221Alexandrian Integers
1289
222Sphere Packing
1316
223Almost right-angled triangles I
878
224Almost right-angled triangles II
735
225Tribonacci non-divisors
2707
226A Scoop of Blancmange
1144
227The Chase
1269
228Minkowski Sums
869
229Four Representations using Squares
915
230Fibonacci Words
1874
231The prime factorisation of binomial coefficients
3349
232The Race
1083
233Lattice points on a circle
1194
234Semidivisible numbers
2150
235An Arithmetic Geometric sequence
3321
236Luxury Hampers
627
237Tours on a 4 x n playing board
962
238Infinite string tour
648
239Twenty-two Foolish Primes
1149
240Top Dice
1404
241Perfection Quotients
588
242Odd Triplets
678
243Resilience
5039
244Sliders
829
245Coresilience
541
246Tangents to an ellipse
527
247Squares under a hyperbola
928
248Numbers for which Euler’s totient function equals 13!
804
249Prime Subset Sums
1472
250250250
1704