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Problems Archives

The problems archives table shows problems 1 to 667. 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
2146
352Blood tests
497
353Risky moon
394
354Distances in a bee's honeycomb
365
355Maximal coprime subset
448
356Largest roots of cubic polynomials
461
357Prime generating integers
6776
358Cyclic numbers
1362
359Hilbert's New Hotel
1279
360Scary Sphere
504
361Subsequence of Thue-Morse sequence
251
362Squarefree factors
389
363B├ęzier Curves
891
364Comfortable distance
577
365A huge binomial coefficient
1000
366Stone Game III
525
367Bozo sort
407
368A Kempner-like series
465
369Badugi
393
370Geometric triangles
439
371Licence plates
1357
372Pencils of rays
341
373Circumscribed Circles
288
374Maximum Integer Partition Product
559
375Minimum of subsequences
734
376Nontransitive sets of dice
216
377Sum of digits, experience 13
579
378Triangle Triples
684
379Least common multiple count
408
380Amazing Mazes!
413
381(prime-k) factorial
3535
382Generating polygons
276
383Divisibility comparison between factorials
419
384Rudin-Shapiro sequence
282
385Ellipses inside triangles
233
386Maximum length of an antichain
602
387Harshad Numbers
3864
388Distinct Lines
474
389Platonic Dice
1268
390Triangles with non rational sides and integral area
494
391Hopping Game
235
392Enmeshed unit circle
612
393Migrating ants
640
394Eating pie
445
395Pythagorean tree
574
396Weak Goodstein sequence
542
397Triangle on parabola
225
398Cutting rope
298
399Squarefree Fibonacci Numbers
476
400Fibonacci tree game
381