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Problems Archives

The problems archives table shows problems 1 to 661. 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
1922
202Laserbeam
2100
203Squarefree Binomial Coefficients
7989
204Generalised Hamming Numbers
6375
205Dice Game
13097
206Concealed Square
21254
207Integer partition equations
4150
208Robot Walks
1469
209Circular Logic
2132
210Obtuse Angled Triangles
1433
211Divisor Square Sum
3570
212Combined Volume of Cuboids
1155
213Flea Circus
1963
214Totient Chains
4509
215Crack-free Walls
3193
216Investigating the primality of numbers of the form 2n2-1
3461
217Balanced Numbers
1250
218Perfect right-angled triangles
2642
219Skew-cost coding
1267
220Heighway Dragon
1920
221Alexandrian Integers
1764
222Sphere Packing
1782
223Almost right-angled triangles I
1258
224Almost right-angled triangles II
1009
225Tribonacci non-divisors
3892
226A Scoop of Blancmange
1491
227The Chase
1777
228Minkowski Sums
1117
229Four Representations using Squares
1253
230Fibonacci Words
2508
231The prime factorisation of binomial coefficients
4728
232The Race
1483
233Lattice points on a circle
1895
234Semidivisible numbers
2841
235An Arithmetic Geometric sequence
4381
236Luxury Hampers
772
237Tours on a 4 x n playing board
1296
238Infinite string tour
797
239Twenty-two Foolish Primes
1525
240Top Dice
1856
241Perfection Quotients
749
242Odd Triplets
864
243Resilience
8296
244Sliders
1086
245Coresilience
689
246Tangents to an ellipse
662
247Squares under a hyperbola
1226
248Numbers for which Euler’s totient function equals 13!
1085
249Prime Subset Sums
2175
250250250
2535