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Problems Archives

The problems archives table shows problems 1 to 667. 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
1945
202Laserbeam
2128
203Squarefree Binomial Coefficients
8086
204Generalised Hamming Numbers
6441
205Dice Game
13249
206Concealed Square
21540
207Integer partition equations
4193
208Robot Walks
1490
209Circular Logic
2153
210Obtuse Angled Triangles
1453
211Divisor Square Sum
3617
212Combined Volume of Cuboids
1169
213Flea Circus
1985
214Totient Chains
4564
215Crack-free Walls
3239
216Investigating the primality of numbers of the form 2n2-1
3511
217Balanced Numbers
1281
218Perfect right-angled triangles
2664
219Skew-cost coding
1285
220Heighway Dragon
1940
221Alexandrian Integers
1786
222Sphere Packing
1809
223Almost right-angled triangles I
1275
224Almost right-angled triangles II
1019
225Tribonacci non-divisors
3928
226A Scoop of Blancmange
1505
227The Chase
1794
228Minkowski Sums
1128
229Four Representations using Squares
1270
230Fibonacci Words
2529
231The prime factorisation of binomial coefficients
4769
232The Race
1503
233Lattice points on a circle
1914
234Semidivisible numbers
2872
235An Arithmetic Geometric sequence
4420
236Luxury Hampers
787
237Tours on a 4 x n playing board
1314
238Infinite string tour
810
239Twenty-two Foolish Primes
1545
240Top Dice
1879
241Perfection Quotients
765
242Odd Triplets
878
243Resilience
8372
244Sliders
1101
245Coresilience
695
246Tangents to an ellipse
670
247Squares under a hyperbola
1242
248Numbers for which Euler’s totient function equals 13!
1097
249Prime Subset Sums
2202
250250250
2563