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Problems Archives

The problems archives table shows problems 1 to 713. 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
2083
202Laserbeam
2282
203Squarefree Binomial Coefficients
8540
204Generalised Hamming Numbers
6822
205Dice Game
14102
206Concealed Square
23121
207Integer partition equations
4413
208Robot Walks
1593
209Circular Logic
2305
210Obtuse Angled Triangles
1550
211Divisor Square Sum
3821
212Combined Volume of Cuboids
1236
213Flea Circus
2113
214Totient Chains
4802
215Crack-free Walls
3417
216Investigating the primality of numbers of the form 2n2-1
3733
217Balanced Numbers
1359
218Perfect right-angled triangles
2815
219Skew-cost coding
1352
220Heighway Dragon
2029
221Alexandrian Integers
1887
222Sphere Packing
1914
223Almost right-angled triangles I
1358
224Almost right-angled triangles II
1090
225Tribonacci non-divisors
4135
226A Scoop of Blancmange
1592
227The Chase
1931
228Minkowski Sums
1198
229Four Representations using Squares
1336
230Fibonacci Words
2691
231The prime factorisation of binomial coefficients
5048
232The Race
1602
233Lattice points on a circle
2060
234Semidivisible numbers
3026
235An Arithmetic Geometric sequence
4653
236Luxury Hampers
831
237Tours on a 4 x n playing board
1414
238Infinite string tour
857
239Twenty-two Foolish Primes
1659
240Top Dice
1993
241Perfection Quotients
826
242Odd Triplets
936
243Resilience
8896
244Sliders
1188
245Coresilience
735
246Tangents to an ellipse
713
247Squares under a hyperbola
1324
248Numbers for which Euler’s totient function equals 13!
1175
249Prime Subset Sums
2329
250250250
2739