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## Problems Archives

The problems archives table shows problems 1 to 751. 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
2210
202Laserbeam
2426
203Squarefree Binomial Coefficients
8909
204Generalised Hamming Numbers
7122
205Dice Game
14643
206Concealed Square
24104
207Integer partition equations
4593
208Robot Walks
1672
209Circular Logic
2416
210Obtuse Angled Triangles
1631
211Divisor Square Sum
4029
212Combined Volume of Cuboids
1299
213Flea Circus
2216
214Totient Chains
5032
215Crack-free Walls
3580
216Investigating the primality of numbers of the form 2n2-1
3911
217Balanced Numbers
1437
218Perfect right-angled triangles
2945
219Skew-cost coding
1409
220Heighway Dragon
2125
221Alexandrian Integers
1987
222Sphere Packing
2016
223Almost right-angled triangles I
1445
224Almost right-angled triangles II
1170
225Tribonacci non-divisors
4320
226A Scoop of Blancmange
1672
227The Chase
2017
228Minkowski Sums
1266
229Four Representations using Squares
1412
230Fibonacci Words
2801
231The prime factorisation of binomial coefficients
5275
232The Race
1692
233Lattice points on a circle
2199
234Semidivisible numbers
3160
235An Arithmetic Geometric sequence
4854
236Luxury Hampers
893
237Tours on a 4 x n playing board
1499
238Infinite string tour
916
239Twenty-two Foolish Primes
1763
240Top Dice
2100
241Perfection Quotients
887
242Odd Triplets
1004
243Resilience
9287
244Sliders
1263
245Coresilience
776
246Tangents to an ellipse
753
247Squares under a hyperbola
1396
248Numbers for which Eulerâ€™s totient function equals 13!
1239
249Prime Subset Sums
2446
250250250
2864