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Problems Archives

The problems archives table shows problems 1 to 699. 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
2256
352Blood tests
514
353Risky moon
409
354Distances in a bee's honeycomb
382
355Maximal coprime subset
461
356Largest roots of cubic polynomials
489
357Prime generating integers
7205
358Cyclic numbers
1442
359Hilbert's New Hotel
1350
360Scary Sphere
527
361Subsequence of Thue-Morse sequence
263
362Squarefree factors
404
363B├ęzier Curves
942
364Comfortable distance
613
365A huge binomial coefficient
1073
366Stone Game III
582
367Bozo sort
431
368A Kempner-like series
478
369Badugi
413
370Geometric triangles
459
371Licence plates
1436
372Pencils of rays
350
373Circumscribed Circles
298
374Maximum Integer Partition Product
591
375Minimum of subsequences
780
376Nontransitive sets of dice
232
377Sum of digits, experience 13
614
378Triangle Triples
730
379Least common multiple count
439
380Amazing Mazes!
437
381(prime-k) factorial
3741
382Generating polygons
295
383Divisibility comparison between factorials
428
384Rudin-Shapiro sequence
289
385Ellipses inside triangles
242
386Maximum length of an antichain
640
387Harshad Numbers
4168
388Distinct Lines
495
389Platonic Dice
1349
390Triangles with non rational sides and integral area
512
391Hopping Game
241
392Enmeshed unit circle
667
393Migrating ants
667
394Eating pie
464
395Pythagorean tree
599
396Weak Goodstein sequence
571
397Triangle on parabola
234
398Cutting rope
315
399Squarefree Fibonacci Numbers
497
400Fibonacci tree game
403