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Problems Archives

The problems archives table shows problems 1 to 632. 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
1866
202Laserbeam
2025
203Squarefree Binomial Coefficients
7717
204Generalised Hamming Numbers
6210
205Dice Game
12633
206Concealed Square
20316
207Integer partition equations
4027
208Robot Walks
1424
209Circular Logic
2066
210Obtuse Angled Triangles
1393
211Divisor Square Sum
3444
212Combined Volume of Cuboids
1122
213Flea Circus
1912
214Totient Chains
4387
215Crack-free Walls
3119
216Investigating the primality of numbers of the form 2n2-1
3348
217Balanced Numbers
1216
218Perfect right-angled triangles
2564
219Skew-cost coding
1232
220Heighway Dragon
1869
221Alexandrian Integers
1701
222Sphere Packing
1705
223Almost right-angled triangles I
1204
224Almost right-angled triangles II
968
225Tribonacci non-divisors
3744
226A Scoop of Blancmange
1449
227The Chase
1710
228Minkowski Sums
1080
229Four Representations using Squares
1208
230Fibonacci Words
2429
231The prime factorisation of binomial coefficients
4601
232The Race
1429
233Lattice points on a circle
1817
234Semidivisible numbers
2777
235An Arithmetic Geometric sequence
4285
236Luxury Hampers
748
237Tours on a 4 x n playing board
1253
238Infinite string tour
771
239Twenty-two Foolish Primes
1480
240Top Dice
1804
241Perfection Quotients
720
242Odd Triplets
840
243Resilience
8038
244Sliders
1054
245Coresilience
667
246Tangents to an ellipse
636
247Squares under a hyperbola
1194
248Numbers for which Euler’s totient function equals 13!
1047
249Prime Subset Sums
2113
250250250
2461