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Problems Archives

The problems archives table shows problems 1 to 641. If you would like to tackle the 10 most recently published problems then go to Recent problems.
Click the description/title of the problem to view details and submit your answer.


IDDescription / TitleSolved By
201Subsets with a unique sum
1876
202Laserbeam
2041
203Squarefree Binomial Coefficients
7786
204Generalised Hamming Numbers
6265
205Dice Game
12773
206Concealed Square
20623
207Integer partition equations
4065
208Robot Walks
1441
209Circular Logic
2085
210Obtuse Angled Triangles
1405
211Divisor Square Sum
3493
212Combined Volume of Cuboids
1133
213Flea Circus
1925
214Totient Chains
4439
215Crack-free Walls
3138
216Investigating the primality of numbers of the form 2n2-1
3380
217Balanced Numbers
1223
218Perfect right-angled triangles
2583
219Skew-cost coding
1243
220Heighway Dragon
1889
221Alexandrian Integers
1726
222Sphere Packing
1735
223Almost right-angled triangles I
1224
224Almost right-angled triangles II
989
225Tribonacci non-divisors
3802
226A Scoop of Blancmange
1466
227The Chase
1735
228Minkowski Sums
1094
229Four Representations using Squares
1223
230Fibonacci Words
2447
231The prime factorisation of binomial coefficients
4644
232The Race
1440
233Lattice points on a circle
1842
234Semidivisible numbers
2796
235An Arithmetic Geometric sequence
4322
236Luxury Hampers
756
237Tours on a 4 x n playing board
1267
238Infinite string tour
779
239Twenty-two Foolish Primes
1496
240Top Dice
1822
241Perfection Quotients
728
242Odd Triplets
849
243Resilience
8132
244Sliders
1067
245Coresilience
675
246Tangents to an ellipse
642
247Squares under a hyperbola
1207
248Numbers for which Euler’s totient function equals 13!
1060
249Prime Subset Sums
2133
250250250
2481