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Problems Archives

The problems archives table shows problems 1 to 746. 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
2177
202Laserbeam
2404
203Squarefree Binomial Coefficients
8846
204Generalised Hamming Numbers
7057
205Dice Game
14534
206Concealed Square
23922
207Integer partition equations
4562
208Robot Walks
1659
209Circular Logic
2394
210Obtuse Angled Triangles
1618
211Divisor Square Sum
3991
212Combined Volume of Cuboids
1292
213Flea Circus
2201
214Totient Chains
4990
215Crack-free Walls
3552
216Investigating the primality of numbers of the form 2n2-1
3876
217Balanced Numbers
1426
218Perfect right-angled triangles
2922
219Skew-cost coding
1400
220Heighway Dragon
2105
221Alexandrian Integers
1967
222Sphere Packing
2002
223Almost right-angled triangles I
1431
224Almost right-angled triangles II
1156
225Tribonacci non-divisors
4290
226A Scoop of Blancmange
1652
227The Chase
2000
228Minkowski Sums
1256
229Four Representations using Squares
1395
230Fibonacci Words
2772
231The prime factorisation of binomial coefficients
5227
232The Race
1670
233Lattice points on a circle
2172
234Semidivisible numbers
3137
235An Arithmetic Geometric sequence
4815
236Luxury Hampers
885
237Tours on a 4 x n playing board
1487
238Infinite string tour
909
239Twenty-two Foolish Primes
1744
240Top Dice
2083
241Perfection Quotients
876
242Odd Triplets
996
243Resilience
9213
244Sliders
1247
245Coresilience
772
246Tangents to an ellipse
743
247Squares under a hyperbola
1386
248Numbers for which Euler’s totient function equals 13!
1226
249Prime Subset Sums
2423
250250250
2839