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Problems Archives

The problems archives table shows problems 1 to 632. 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
2022
352Blood tests
470
353Risky moon
378
354Distances in a bee's honeycomb
338
355Maximal coprime subset
422
356Largest roots of cubic polynomials
432
357Prime generating integers
6197
358Cyclic numbers
1306
359Hilbert's New Hotel
1214
360Scary Sphere
483
361Subsequence of Thue-Morse sequence
241
362Squarefree factors
368
363Bézier Curves
844
364Comfortable distance
543
365A huge binomial coefficient
947
366Stone Game III
480
367Bozo sort
386
368A Kempner-like series
440
369Badugi
376
370Geometric triangles
418
371Licence plates
1266
372Pencils of rays
327
373Circumscribed Circles
278
374Maximum Integer Partition Product
520
375Minimum of subsequences
687
376Nontransitive sets of dice
206
377Sum of digits, experience 13
533
378Triangle Triples
637
379Least common multiple count
386
380Amazing Mazes!
395
381(prime-k) factorial
3280
382Generating polygons
265
383Divisibility comparison between factorials
391
384Rudin-Shapiro sequence
273
385Ellipses inside triangles
226
386Maximum length of an antichain
573
387Harshad Numbers
3451
388Distinct Lines
450
389Platonic Dice
1193
390Triangles with non rational sides and integral area
478
391Hopping Game
221
392Enmeshed unit circle
575
393Migrating ants
599
394Eating pie
424
395Pythagorean tree
542
396Weak Goodstein sequence
510
397Triangle on parabola
215
398Cutting rope
281
399Squarefree Fibonacci Numbers
455
400Fibonacci tree game
354