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Problems Archives

The problems archives table shows problems 1 to 661. 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
2117
352Blood tests
485
353Risky moon
387
354Distances in a bee's honeycomb
353
355Maximal coprime subset
442
356Largest roots of cubic polynomials
454
357Prime generating integers
6630
358Cyclic numbers
1347
359Hilbert's New Hotel
1262
360Scary Sphere
497
361Subsequence of Thue-Morse sequence
247
362Squarefree factors
380
363Bézier Curves
877
364Comfortable distance
568
365A huge binomial coefficient
985
366Stone Game III
513
367Bozo sort
401
368A Kempner-like series
458
369Badugi
386
370Geometric triangles
428
371Licence plates
1340
372Pencils of rays
336
373Circumscribed Circles
284
374Maximum Integer Partition Product
550
375Minimum of subsequences
722
376Nontransitive sets of dice
210
377Sum of digits, experience 13
564
378Triangle Triples
665
379Least common multiple count
398
380Amazing Mazes!
403
381(prime-k) factorial
3464
382Generating polygons
272
383Divisibility comparison between factorials
407
384Rudin-Shapiro sequence
278
385Ellipses inside triangles
229
386Maximum length of an antichain
594
387Harshad Numbers
3767
388Distinct Lines
463
389Platonic Dice
1251
390Triangles with non rational sides and integral area
489
391Hopping Game
232
392Enmeshed unit circle
603
393Migrating ants
628
394Eating pie
436
395Pythagorean tree
564
396Weak Goodstein sequence
531
397Triangle on parabola
221
398Cutting rope
291
399Squarefree Fibonacci Numbers
471
400Fibonacci tree game
375