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Problems Archives

The problems archives table shows problems 1 to 699. 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
2053
202Laserbeam
2241
203Squarefree Binomial Coefficients
8413
204Generalised Hamming Numbers
6710
205Dice Game
13856
206Concealed Square
22641
207Integer partition equations
4349
208Robot Walks
1556
209Circular Logic
2266
210Obtuse Angled Triangles
1521
211Divisor Square Sum
3751
212Combined Volume of Cuboids
1219
213Flea Circus
2067
214Totient Chains
4712
215Crack-free Walls
3361
216Investigating the primality of numbers of the form 2n2-1
3675
217Balanced Numbers
1340
218Perfect right-angled triangles
2771
219Skew-cost coding
1339
220Heighway Dragon
2006
221Alexandrian Integers
1856
222Sphere Packing
1892
223Almost right-angled triangles I
1336
224Almost right-angled triangles II
1074
225Tribonacci non-divisors
4072
226A Scoop of Blancmange
1571
227The Chase
1910
228Minkowski Sums
1178
229Four Representations using Squares
1327
230Fibonacci Words
2636
231The prime factorisation of binomial coefficients
4949
232The Race
1573
233Lattice points on a circle
2023
234Semidivisible numbers
2985
235An Arithmetic Geometric sequence
4590
236Luxury Hampers
821
237Tours on a 4 x n playing board
1394
238Infinite string tour
853
239Twenty-two Foolish Primes
1629
240Top Dice
1968
241Perfection Quotients
824
242Odd Triplets
924
243Resilience
8742
244Sliders
1177
245Coresilience
732
246Tangents to an ellipse
709
247Squares under a hyperbola
1305
248Numbers for which Euler’s totient function equals 13!
1155
249Prime Subset Sums
2299
250250250
2675