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Problems Archives

  • Problem 743 will be accessible in 3 hours, 37 minutes (Saturday, 16th January 2021, 10:00 pm)

The problems archives table shows problems 1 to 732. 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
2389
352Blood tests
549
353Risky moon
432
354Distances in a bee's honeycomb
400
355Maximal coprime subset
485
356Largest roots of cubic polynomials
533
357Prime generating integers
7640
358Cyclic numbers
1508
359Hilbert's New Hotel
1422
360Scary Sphere
555
361Subsequence of Thue-Morse sequence
273
362Squarefree factors
427
363B├ęzier Curves
999
364Comfortable distance
644
365A huge binomial coefficient
1125
366Stone Game III
613
367Bozo sort
461
368A Kempner-like series
504
369Badugi
425
370Geometric triangles
477
371Licence plates
1503
372Pencils of rays
370
373Circumscribed Circles
309
374Maximum Integer Partition Product
622
375Minimum of subsequences
814
376Nontransitive sets of dice
249
377Sum of digits, experience 13
649
378Triangle Triples
782
379Least common multiple count
469
380Amazing Mazes!
460
381(prime-k) factorial
3939
382Generating polygons
305
383Divisibility comparison between factorials
445
384Rudin-Shapiro sequence
304
385Ellipses inside triangles
253
386Maximum length of an antichain
667
387Harshad Numbers
4404
388Distinct Lines
516
389Platonic Dice
1412
390Triangles with non rational sides and integral area
532
391Hopping Game
258
392Enmeshed unit circle
700
393Migrating ants
700
394Eating pie
483
395Pythagorean tree
638
396Weak Goodstein sequence
612
397Triangle on parabola
245
398Cutting rope
337
399Squarefree Fibonacci Numbers
521
400Fibonacci tree game
424