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Problems Archives

  • Problem 699 will be accessible in 4 hours, 36 minutes (Sunday, 26th January 2020, 10:00 am)

The problems archives table shows problems 1 to 688. 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
351Hexagonal orchards
2225
352Blood tests
511
353Risky moon
407
354Distances in a bee's honeycomb
376
355Maximal coprime subset
458
356Largest roots of cubic polynomials
477
357Prime generating integers
7104
358Cyclic numbers
1423
359Hilbert's New Hotel
1332
360Scary Sphere
519
361Subsequence of Thue-Morse sequence
261
362Squarefree factors
401
363Bézier Curves
931
364Comfortable distance
602
365A huge binomial coefficient
1049
366Stone Game III
562
367Bozo sort
427
368A Kempner-like series
474
369Badugi
406
370Geometric triangles
452
371Licence plates
1418
372Pencils of rays
348
373Circumscribed Circles
297
374Maximum Integer Partition Product
580
375Minimum of subsequences
763
376Nontransitive sets of dice
227
377Sum of digits, experience 13
603
378Triangle Triples
715
379Least common multiple count
433
380Amazing Mazes!
430
381(prime-k) factorial
3697
382Generating polygons
284
383Divisibility comparison between factorials
423
384Rudin-Shapiro sequence
288
385Ellipses inside triangles
239
386Maximum length of an antichain
631
387Harshad Numbers
4106
388Distinct Lines
489
389Platonic Dice
1328
390Triangles with non rational sides and integral area
508
391Hopping Game
241
392Enmeshed unit circle
650
393Migrating ants
659
394Eating pie
460
395Pythagorean tree
590
396Weak Goodstein sequence
567
397Triangle on parabola
231
398Cutting rope
309
399Squarefree Fibonacci Numbers
493
400Fibonacci tree game
397