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Problems Archives

The problems archives table shows problems 1 to 617. 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
1951
352Blood tests
466
353Risky moon
371
354Distances in a bee's honeycomb
333
355Maximal coprime subset
407
356Largest roots of cubic polynomials
421
357Prime generating integers
5840
358Cyclic numbers
1251
359Hilbert's New Hotel
1177
360Scary Sphere
481
361Subsequence of Thue-Morse sequence
244
362Squarefree factors
365
363B├ęzier Curves
824
364Comfortable distance
532
365A huge binomial coefficient
919
366Stone Game III
475
367Bozo sort
378
368A Kempner-like series
440
369Badugi
371
370Geometric triangles
409
371Licence plates
1235
372Pencils of rays
320
373Circumscribed Circles
274
374Maximum Integer Partition Product
516
375Minimum of subsequences
669
376Nontransitive sets of dice
212
377Sum of digits, experience 13
527
378Triangle Triples
621
379Least common multiple count
388
380Amazing Mazes!
398
381(prime-k) factorial
3115
382Generating polygons
267
383Divisibility comparison between factorials
392
384Rudin-Shapiro sequence
269
385Ellipses inside triangles
226
386Maximum length of an antichain
565
387Harshad Numbers
3186
388Distinct Lines
451
389Platonic Dice
1160
390Triangles with non rational sides and integral area
478
391Hopping Game
227
392Enmeshed unit circle
557
393Migrating ants
580
394Eating pie
415
395Pythagorean tree
532
396Weak Goodstein sequence
503
397Triangle on parabola
215
398Cutting rope
282
399Squarefree Fibonacci Numbers
452
400Fibonacci tree game
355