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Problems Archives

The problems archives table shows problems 1 to 652. 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
2090
352Blood tests
481
353Risky moon
381
354Distances in a bee's honeycomb
347
355Maximal coprime subset
435
356Largest roots of cubic polynomials
449
357Prime generating integers
6512
358Cyclic numbers
1336
359Hilbert's New Hotel
1245
360Scary Sphere
492
361Subsequence of Thue-Morse sequence
244
362Squarefree factors
375
363Bézier Curves
866
364Comfortable distance
560
365A huge binomial coefficient
973
366Stone Game III
501
367Bozo sort
394
368A Kempner-like series
452
369Badugi
382
370Geometric triangles
426
371Licence plates
1314
372Pencils of rays
329
373Circumscribed Circles
282
374Maximum Integer Partition Product
541
375Minimum of subsequences
707
376Nontransitive sets of dice
208
377Sum of digits, experience 13
557
378Triangle Triples
658
379Least common multiple count
393
380Amazing Mazes!
399
381(prime-k) factorial
3414
382Generating polygons
270
383Divisibility comparison between factorials
401
384Rudin-Shapiro sequence
277
385Ellipses inside triangles
227
386Maximum length of an antichain
590
387Harshad Numbers
3674
388Distinct Lines
461
389Platonic Dice
1231
390Triangles with non rational sides and integral area
487
391Hopping Game
231
392Enmeshed unit circle
594
393Migrating ants
617
394Eating pie
430
395Pythagorean tree
562
396Weak Goodstein sequence
524
397Triangle on parabola
221
398Cutting rope
287
399Squarefree Fibonacci Numbers
468
400Fibonacci tree game
370