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Problems Archives

The problems archives table shows problems 1 to 621. 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
1824
202Laserbeam
1974
203Squarefree Binomial Coefficients
7580
204Generalised Hamming Numbers
6108
205Dice Game
12322
206Concealed Square
19757
207Integer partition equations
3933
208Robot Walks
1403
209Circular Logic
2027
210Obtuse Angled Triangles
1364
211Divisor Square Sum
3377
212Combined Volume of Cuboids
1094
213Flea Circus
1871
214Totient Chains
4314
215Crack-free Walls
3049
216Investigating the primality of numbers of the form 2n2-1
3290
217Balanced Numbers
1179
218Perfect right-angled triangles
2466
219Skew-cost coding
1202
220Heighway Dragon
1836
221Alexandrian Integers
1656
222Sphere Packing
1673
223Almost right-angled triangles I
1181
224Almost right-angled triangles II
947
225Tribonacci non-divisors
3691
226A Scoop of Blancmange
1426
227The Chase
1683
228Minkowski Sums
1057
229Four Representations using Squares
1185
230Fibonacci Words
2383
231The prime factorisation of binomial coefficients
4526
232The Race
1405
233Lattice points on a circle
1768
234Semidivisible numbers
2729
235An Arithmetic Geometric sequence
4215
236Luxury Hampers
737
237Tours on a 4 x n playing board
1228
238Infinite string tour
764
239Twenty-two Foolish Primes
1450
240Top Dice
1778
241Perfection Quotients
711
242Odd Triplets
829
243Resilience
7890
244Sliders
1037
245Coresilience
661
246Tangents to an ellipse
628
247Squares under a hyperbola
1177
248Numbers for which Euler’s totient function equals 13!
1026
249Prime Subset Sums
2070
250250250
2419