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Problems Archives

The problems archives table shows problems 1 to 679. 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
1978
202Laserbeam
2183
203Squarefree Binomial Coefficients
8229
204Generalised Hamming Numbers
6558
205Dice Game
13536
206Concealed Square
22039
207Integer partition equations
4261
208Robot Walks
1517
209Circular Logic
2196
210Obtuse Angled Triangles
1483
211Divisor Square Sum
3686
212Combined Volume of Cuboids
1188
213Flea Circus
2027
214Totient Chains
4626
215Crack-free Walls
3301
216Investigating the primality of numbers of the form 2n2-1
3573
217Balanced Numbers
1305
218Perfect right-angled triangles
2718
219Skew-cost coding
1303
220Heighway Dragon
1962
221Alexandrian Integers
1817
222Sphere Packing
1840
223Almost right-angled triangles I
1301
224Almost right-angled triangles II
1043
225Tribonacci non-divisors
3984
226A Scoop of Blancmange
1534
227The Chase
1861
228Minkowski Sums
1158
229Four Representations using Squares
1297
230Fibonacci Words
2567
231The prime factorisation of binomial coefficients
4852
232The Race
1544
233Lattice points on a circle
1964
234Semidivisible numbers
2921
235An Arithmetic Geometric sequence
4497
236Luxury Hampers
806
237Tours on a 4 x n playing board
1362
238Infinite string tour
829
239Twenty-two Foolish Primes
1583
240Top Dice
1916
241Perfection Quotients
798
242Odd Triplets
900
243Resilience
8551
244Sliders
1127
245Coresilience
703
246Tangents to an ellipse
680
247Squares under a hyperbola
1269
248Numbers for which Euler’s totient function equals 13!
1120
249Prime Subset Sums
2233
250250250
2613