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Problems Archives

The problems archives table shows problems 1 to 739. 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.


ID

Description / TitleSolved By
201Subsets with a unique sum
2157
202Laserbeam
2378
203Squarefree Binomial Coefficients
8780
204Generalised Hamming Numbers
7008
205Dice Game
14452
206Concealed Square
23774
207Integer partition equations
4540
208Robot Walks
1646
209Circular Logic
2376
210Obtuse Angled Triangles
1608
211Divisor Square Sum
3952
212Combined Volume of Cuboids
1280
213Flea Circus
2182
214Totient Chains
4952
215Crack-free Walls
3525
216Investigating the primality of numbers of the form 2n2-1
3845
217Balanced Numbers
1413
218Perfect right-angled triangles
2905
219Skew-cost coding
1395
220Heighway Dragon
2094
221Alexandrian Integers
1955
222Sphere Packing
1987
223Almost right-angled triangles I
1418
224Almost right-angled triangles II
1152
225Tribonacci non-divisors
4267
226A Scoop of Blancmange
1645
227The Chase
1992
228Minkowski Sums
1251
229Four Representations using Squares
1387
230Fibonacci Words
2762
231The prime factorisation of binomial coefficients
5192
232The Race
1659
233Lattice points on a circle
2154
234Semidivisible numbers
3120
235An Arithmetic Geometric sequence
4784
236Luxury Hampers
875
237Tours on a 4 x n playing board
1477
238Infinite string tour
898
239Twenty-two Foolish Primes
1730
240Top Dice
2066
241Perfection Quotients
870
242Odd Triplets
983
243Resilience
9146
244Sliders
1236
245Coresilience
767
246Tangents to an ellipse
737
247Squares under a hyperbola
1376
248Numbers for which Euler’s totient function equals 13!
1221
249Prime Subset Sums
2404
250250250
2820