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Problems Archives

  • Problem 727 will be accessible in 8 hours, 50 minutes (Saturday, 26th September 2020, 11:00 pm)

The problems archives table shows problems 1 to 716. 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
351Hexagonal orchards
2360
352Blood tests
535
353Risky moon
418
354Distances in a bee's honeycomb
395
355Maximal coprime subset
475
356Largest roots of cubic polynomials
522
357Prime generating integers
7499
358Cyclic numbers
1487
359Hilbert's New Hotel
1398
360Scary Sphere
544
361Subsequence of Thue-Morse sequence
269
362Squarefree factors
423
363Bézier Curves
976
364Comfortable distance
632
365A huge binomial coefficient
1102
366Stone Game III
604
367Bozo sort
444
368A Kempner-like series
492
369Badugi
421
370Geometric triangles
470
371Licence plates
1479
372Pencils of rays
363
373Circumscribed Circles
310
374Maximum Integer Partition Product
610
375Minimum of subsequences
799
376Nontransitive sets of dice
242
377Sum of digits, experience 13
637
378Triangle Triples
767
379Least common multiple count
459
380Amazing Mazes!
457
381(prime-k) factorial
3879
382Generating polygons
300
383Divisibility comparison between factorials
439
384Rudin-Shapiro sequence
300
385Ellipses inside triangles
252
386Maximum length of an antichain
659
387Harshad Numbers
4331
388Distinct Lines
510
389Platonic Dice
1390
390Triangles with non rational sides and integral area
523
391Hopping Game
252
392Enmeshed unit circle
691
393Migrating ants
691
394Eating pie
478
395Pythagorean tree
625
396Weak Goodstein sequence
595
397Triangle on parabola
242
398Cutting rope
327
399Squarefree Fibonacci Numbers
511
400Fibonacci tree game
411