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Problems Archives

The problems archives table shows problems 1 to 652. 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
1901
202Laserbeam
2077
203Squarefree Binomial Coefficients
7890
204Generalised Hamming Numbers
6329
205Dice Game
12968
206Concealed Square
20982
207Integer partition equations
4111
208Robot Walks
1461
209Circular Logic
2108
210Obtuse Angled Triangles
1417
211Divisor Square Sum
3529
212Combined Volume of Cuboids
1143
213Flea Circus
1946
214Totient Chains
4468
215Crack-free Walls
3161
216Investigating the primality of numbers of the form 2n2-1
3427
217Balanced Numbers
1236
218Perfect right-angled triangles
2619
219Skew-cost coding
1250
220Heighway Dragon
1901
221Alexandrian Integers
1747
222Sphere Packing
1763
223Almost right-angled triangles I
1243
224Almost right-angled triangles II
1001
225Tribonacci non-divisors
3854
226A Scoop of Blancmange
1482
227The Chase
1762
228Minkowski Sums
1105
229Four Representations using Squares
1241
230Fibonacci Words
2478
231The prime factorisation of binomial coefficients
4683
232The Race
1457
233Lattice points on a circle
1869
234Semidivisible numbers
2813
235An Arithmetic Geometric sequence
4359
236Luxury Hampers
764
237Tours on a 4 x n playing board
1281
238Infinite string tour
788
239Twenty-two Foolish Primes
1508
240Top Dice
1835
241Perfection Quotients
739
242Odd Triplets
853
243Resilience
8220
244Sliders
1072
245Coresilience
682
246Tangents to an ellipse
651
247Squares under a hyperbola
1219
248Numbers for which Euler’s totient function equals 13!
1071
249Prime Subset Sums
2159
250250250
2513