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Problems Archives

The problems archives table shows problems 1 to 617. 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
1817
202Laserbeam
1970
203Squarefree Binomial Coefficients
7523
204Generalised Hamming Numbers
6060
205Dice Game
12199
206Concealed Square
19497
207Integer partition equations
3913
208Robot Walks
1396
209Circular Logic
2024
210Obtuse Angled Triangles
1361
211Divisor Square Sum
3366
212Combined Volume of Cuboids
1089
213Flea Circus
1862
214Totient Chains
4290
215Crack-free Walls
3028
216Investigating the primality of numbers of the form 2n2-1
3276
217Balanced Numbers
1176
218Perfect right-angled triangles
2460
219Skew-cost coding
1204
220Heighway Dragon
1839
221Alexandrian Integers
1649
222Sphere Packing
1675
223Almost right-angled triangles I
1178
224Almost right-angled triangles II
944
225Tribonacci non-divisors
3682
226A Scoop of Blancmange
1429
227The Chase
1674
228Minkowski Sums
1059
229Four Representations using Squares
1187
230Fibonacci Words
2378
231The prime factorisation of binomial coefficients
4498
232The Race
1397
233Lattice points on a circle
1761
234Semidivisible numbers
2726
235An Arithmetic Geometric sequence
4200
236Luxury Hampers
738
237Tours on a 4 x n playing board
1226
238Infinite string tour
762
239Twenty-two Foolish Primes
1440
240Top Dice
1774
241Perfection Quotients
709
242Odd Triplets
828
243Resilience
7842
244Sliders
1042
245Coresilience
657
246Tangents to an ellipse
626
247Squares under a hyperbola
1171
248Numbers for which Euler’s totient function equals 13!
1027
249Prime Subset Sums
2065
250250250
2403