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Problems Archives

The problems archives table shows problems 1 to 713. 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
2321
352Blood tests
531
353Risky moon
414
354Distances in a bee's honeycomb
387
355Maximal coprime subset
469
356Largest roots of cubic polynomials
512
357Prime generating integers
7381
358Cyclic numbers
1466
359Hilbert's New Hotel
1379
360Scary Sphere
538
361Subsequence of Thue-Morse sequence
267
362Squarefree factors
413
363Bézier Curves
959
364Comfortable distance
623
365A huge binomial coefficient
1087
366Stone Game III
594
367Bozo sort
438
368A Kempner-like series
489
369Badugi
416
370Geometric triangles
467
371Licence plates
1460
372Pencils of rays
357
373Circumscribed Circles
301
374Maximum Integer Partition Product
600
375Minimum of subsequences
789
376Nontransitive sets of dice
237
377Sum of digits, experience 13
626
378Triangle Triples
753
379Least common multiple count
447
380Amazing Mazes!
444
381(prime-k) factorial
3825
382Generating polygons
294
383Divisibility comparison between factorials
437
384Rudin-Shapiro sequence
293
385Ellipses inside triangles
247
386Maximum length of an antichain
650
387Harshad Numbers
4267
388Distinct Lines
503
389Platonic Dice
1370
390Triangles with non rational sides and integral area
515
391Hopping Game
247
392Enmeshed unit circle
678
393Migrating ants
684
394Eating pie
472
395Pythagorean tree
615
396Weak Goodstein sequence
587
397Triangle on parabola
238
398Cutting rope
323
399Squarefree Fibonacci Numbers
508
400Fibonacci tree game
407