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Problems Archives

The problems archives table shows problems 1 to 726. 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.


ID

Description / TitleSolved By
201Subsets with a unique sum
2133
202Laserbeam
2346
203Squarefree Binomial Coefficients
8694
204Generalised Hamming Numbers
6942
205Dice Game
14336
206Concealed Square
23530
207Integer partition equations
4495
208Robot Walks
1625
209Circular Logic
2350
210Obtuse Angled Triangles
1589
211Divisor Square Sum
3905
212Combined Volume of Cuboids
1264
213Flea Circus
2159
214Totient Chains
4897
215Crack-free Walls
3494
216Investigating the primality of numbers of the form 2n2-1
3812
217Balanced Numbers
1388
218Perfect right-angled triangles
2877
219Skew-cost coding
1380
220Heighway Dragon
2070
221Alexandrian Integers
1938
222Sphere Packing
1967
223Almost right-angled triangles I
1400
224Almost right-angled triangles II
1135
225Tribonacci non-divisors
4217
226A Scoop of Blancmange
1631
227The Chase
1967
228Minkowski Sums
1229
229Four Representations using Squares
1368
230Fibonacci Words
2743
231The prime factorisation of binomial coefficients
5135
232The Race
1637
233Lattice points on a circle
2117
234Semidivisible numbers
3084
235An Arithmetic Geometric sequence
4742
236Luxury Hampers
852
237Tours on a 4 x n playing board
1455
238Infinite string tour
883
239Twenty-two Foolish Primes
1709
240Top Dice
2035
241Perfection Quotients
851
242Odd Triplets
964
243Resilience
9059
244Sliders
1215
245Coresilience
758
246Tangents to an ellipse
734
247Squares under a hyperbola
1355
248Numbers for which Euler’s totient function equals 13!
1202
249Prime Subset Sums
2378
250250250
2794