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Problems Archives

The problems archives table shows problems 1 to 641. 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
2050
352Blood tests
475
353Risky moon
379
354Distances in a bee's honeycomb
342
355Maximal coprime subset
433
356Largest roots of cubic polynomials
439
357Prime generating integers
6339
358Cyclic numbers
1318
359Hilbert's New Hotel
1229
360Scary Sphere
485
361Subsequence of Thue-Morse sequence
245
362Squarefree factors
373
363B├ęzier Curves
858
364Comfortable distance
552
365A huge binomial coefficient
958
366Stone Game III
492
367Bozo sort
389
368A Kempner-like series
446
369Badugi
378
370Geometric triangles
424
371Licence plates
1289
372Pencils of rays
329
373Circumscribed Circles
280
374Maximum Integer Partition Product
530
375Minimum of subsequences
698
376Nontransitive sets of dice
208
377Sum of digits, experience 13
548
378Triangle Triples
653
379Least common multiple count
390
380Amazing Mazes!
396
381(prime-k) factorial
3340
382Generating polygons
268
383Divisibility comparison between factorials
399
384Rudin-Shapiro sequence
277
385Ellipses inside triangles
227
386Maximum length of an antichain
581
387Harshad Numbers
3558
388Distinct Lines
457
389Platonic Dice
1215
390Triangles with non rational sides and integral area
483
391Hopping Game
231
392Enmeshed unit circle
583
393Migrating ants
608
394Eating pie
427
395Pythagorean tree
558
396Weak Goodstein sequence
515
397Triangle on parabola
217
398Cutting rope
284
399Squarefree Fibonacci Numbers
459
400Fibonacci tree game
362