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Problems Archives

The problems archives table shows problems 1 to 621. 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
1973
352Blood tests
470
353Risky moon
374
354Distances in a bee's honeycomb
332
355Maximal coprime subset
409
356Largest roots of cubic polynomials
420
357Prime generating integers
5941
358Cyclic numbers
1263
359Hilbert's New Hotel
1185
360Scary Sphere
477
361Subsequence of Thue-Morse sequence
241
362Squarefree factors
362
363B├ęzier Curves
828
364Comfortable distance
535
365A huge binomial coefficient
922
366Stone Game III
476
367Bozo sort
379
368A Kempner-like series
440
369Badugi
372
370Geometric triangles
412
371Licence plates
1247
372Pencils of rays
324
373Circumscribed Circles
275
374Maximum Integer Partition Product
517
375Minimum of subsequences
673
376Nontransitive sets of dice
209
377Sum of digits, experience 13
527
378Triangle Triples
625
379Least common multiple count
387
380Amazing Mazes!
397
381(prime-k) factorial
3153
382Generating polygons
265
383Divisibility comparison between factorials
387
384Rudin-Shapiro sequence
272
385Ellipses inside triangles
225
386Maximum length of an antichain
566
387Harshad Numbers
3250
388Distinct Lines
450
389Platonic Dice
1167
390Triangles with non rational sides and integral area
474
391Hopping Game
224
392Enmeshed unit circle
566
393Migrating ants
585
394Eating pie
415
395Pythagorean tree
534
396Weak Goodstein sequence
505
397Triangle on parabola
213
398Cutting rope
281
399Squarefree Fibonacci Numbers
452
400Fibonacci tree game
352