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Problems Archives

The problems archives table shows problems 1 to 627. 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
1995
352Blood tests
468
353Risky moon
373
354Distances in a bee's honeycomb
333
355Maximal coprime subset
417
356Largest roots of cubic polynomials
425
357Prime generating integers
6072
358Cyclic numbers
1296
359Hilbert's New Hotel
1205
360Scary Sphere
480
361Subsequence of Thue-Morse sequence
239
362Squarefree factors
364
363Bézier Curves
831
364Comfortable distance
533
365A huge binomial coefficient
935
366Stone Game III
477
367Bozo sort
378
368A Kempner-like series
438
369Badugi
373
370Geometric triangles
414
371Licence plates
1258
372Pencils of rays
323
373Circumscribed Circles
278
374Maximum Integer Partition Product
514
375Minimum of subsequences
679
376Nontransitive sets of dice
206
377Sum of digits, experience 13
526
378Triangle Triples
630
379Least common multiple count
384
380Amazing Mazes!
395
381(prime-k) factorial
3217
382Generating polygons
263
383Divisibility comparison between factorials
388
384Rudin-Shapiro sequence
271
385Ellipses inside triangles
224
386Maximum length of an antichain
569
387Harshad Numbers
3366
388Distinct Lines
449
389Platonic Dice
1179
390Triangles with non rational sides and integral area
474
391Hopping Game
219
392Enmeshed unit circle
567
393Migrating ants
594
394Eating pie
419
395Pythagorean tree
538
396Weak Goodstein sequence
507
397Triangle on parabola
212
398Cutting rope
280
399Squarefree Fibonacci Numbers
450
400Fibonacci tree game
351