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Problems Archives

  • Problem 731 will be accessible in 7 hours, 16 minutes (Sunday, 25th October 2020, 10:00 am)

The problems archives table shows problems 1 to 720. 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
1260
252Convex Holes
758
253Tidying up
945
254Sums of Digit Factorials
873
255Rounded Square Roots
793
256Tatami-Free Rooms
667
257Angular Bisectors
620
258A lagged Fibonacci sequence
1461
259Reachable Numbers
1390
260Stone Game
1200
261Pivotal Square Sums
617
262Mountain Range
647
263An engineers' dream come true
932
264Triangle Centres
514
265Binary Circles
3940
266Pseudo Square Root
1555
267Billionaire
3155
268Counting numbers with at least four distinct prime factors less than 100
1323
269Polynomials with at least one integer root
625
270Cutting Squares
587
271Modular Cubes, part 1
2195
272Modular Cubes, part 2
865
273Sum of Squares
1254
274Divisibility Multipliers
1311
275Balanced Sculptures
547
276Primitive Triangles
985
277A Modified Collatz sequence
3001
278Linear Combinations of Semiprimes
946
279Triangles with integral sides and an integral angle
645
280Ant and seeds
944
281Pizza Toppings
869
282The Ackermann function
910
283Integer sided triangles for which the area/perimeter ratio is integral
588
284Steady Squares
1156
285Pythagorean odds
1102
286Scoring probabilities
1973
287Quadtree encoding (a simple compression algorithm)
1315
288An enormous factorial
1522
289Eulerian Cycles
439
290Digital Signature
893
291Panaitopol Primes
1318
292Pythagorean Polygons
523
293Pseudo-Fortunate Numbers
2728
294Sum of digits - experience #23
833
295Lenticular holes
414
296Angular Bisector and Tangent
523
297Zeckendorf Representation
2594
298Selective Amnesia
609
299Three similar triangles
562
300Protein folding
1005