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Problems Archives

  • Problem 680 will be accessible in 19 hours, 7 minutes (Sunday, 22nd September 2019, 04:00 am)

The problems archives table shows problems 1 to 669. 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
2171
352Blood tests
502
353Risky moon
397
354Distances in a bee's honeycomb
367
355Maximal coprime subset
450
356Largest roots of cubic polynomials
463
357Prime generating integers
6881
358Cyclic numbers
1386
359Hilbert's New Hotel
1302
360Scary Sphere
508
361Subsequence of Thue-Morse sequence
256
362Squarefree factors
389
363Bézier Curves
913
364Comfortable distance
582
365A huge binomial coefficient
1012
366Stone Game III
527
367Bozo sort
412
368A Kempner-like series
468
369Badugi
396
370Geometric triangles
442
371Licence plates
1379
372Pencils of rays
341
373Circumscribed Circles
289
374Maximum Integer Partition Product
564
375Minimum of subsequences
739
376Nontransitive sets of dice
216
377Sum of digits, experience 13
586
378Triangle Triples
695
379Least common multiple count
416
380Amazing Mazes!
414
381(prime-k) factorial
3593
382Generating polygons
280
383Divisibility comparison between factorials
417
384Rudin-Shapiro sequence
285
385Ellipses inside triangles
237
386Maximum length of an antichain
609
387Harshad Numbers
3951
388Distinct Lines
478
389Platonic Dice
1291
390Triangles with non rational sides and integral area
501
391Hopping Game
235
392Enmeshed unit circle
621
393Migrating ants
641
394Eating pie
449
395Pythagorean tree
578
396Weak Goodstein sequence
549
397Triangle on parabola
228
398Cutting rope
301
399Squarefree Fibonacci Numbers
481
400Fibonacci tree game
388