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Problems Archives

The problems archives table shows problems 1 to 679. 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
2198
352Blood tests
506
353Risky moon
399
354Distances in a bee's honeycomb
369
355Maximal coprime subset
452
356Largest roots of cubic polynomials
472
357Prime generating integers
6988
358Cyclic numbers
1411
359Hilbert's New Hotel
1320
360Scary Sphere
512
361Subsequence of Thue-Morse sequence
259
362Squarefree factors
393
363Bézier Curves
919
364Comfortable distance
591
365A huge binomial coefficient
1025
366Stone Game III
532
367Bozo sort
418
368A Kempner-like series
470
369Badugi
400
370Geometric triangles
444
371Licence plates
1394
372Pencils of rays
343
373Circumscribed Circles
293
374Maximum Integer Partition Product
568
375Minimum of subsequences
745
376Nontransitive sets of dice
221
377Sum of digits, experience 13
591
378Triangle Triples
707
379Least common multiple count
423
380Amazing Mazes!
420
381(prime-k) factorial
3636
382Generating polygons
280
383Divisibility comparison between factorials
417
384Rudin-Shapiro sequence
285
385Ellipses inside triangles
237
386Maximum length of an antichain
620
387Harshad Numbers
4035
388Distinct Lines
482
389Platonic Dice
1310
390Triangles with non rational sides and integral area
503
391Hopping Game
236
392Enmeshed unit circle
633
393Migrating ants
648
394Eating pie
453
395Pythagorean tree
583
396Weak Goodstein sequence
559
397Triangle on parabola
229
398Cutting rope
306
399Squarefree Fibonacci Numbers
484
400Fibonacci tree game
395