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Problems Archives

  • Problem 744 will be accessible in 22 hours, 38 minutes (Sunday, 24th January 2021, 01:00 am)

The problems archives table shows problems 1 to 733. 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
251Cardano Triplets
1285
252Convex Holes
768
253Tidying up
949
254Sums of Digit Factorials
883
255Rounded Square Roots
801
256Tatami-Free Rooms
679
257Angular Bisectors
628
258A lagged Fibonacci sequence
1481
259Reachable Numbers
1402
260Stone Game
1221
261Pivotal Square Sums
627
262Mountain Range
655
263An engineers' dream come true
945
264Triangle Centres
522
265Binary Circles
3982
266Pseudo Square Root
1575
267Billionaire
3183
268Counting numbers with at least four distinct prime factors less than 100
1345
269Polynomials with at least one integer root
634
270Cutting Squares
592
271Modular Cubes, part 1
2218
272Modular Cubes, part 2
880
273Sum of Squares
1267
274Divisibility Multipliers
1325
275Balanced Sculptures
552
276Primitive Triangles
1003
277A Modified Collatz sequence
3036
278Linear Combinations of Semiprimes
965
279Triangles with integral sides and an integral angle
653
280Ant and seeds
951
281Pizza Toppings
888
282The Ackermann function
923
283Integer sided triangles for which the area/perimeter ratio is integral
594
284Steady Squares
1171
285Pythagorean odds
1119
286Scoring probabilities
1994
287Quadtree encoding (a simple compression algorithm)
1341
288An enormous factorial
1535
289Eulerian Cycles
450
290Digital Signature
904
291Panaitopol Primes
1335
292Pythagorean Polygons
529
293Pseudo-Fortunate Numbers
2766
294Sum of digits - experience #23
845
295Lenticular holes
418
296Angular Bisector and Tangent
535
297Zeckendorf Representation
2626
298Selective Amnesia
625
299Three similar triangles
571
300Protein folding
1020