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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
251Cardano Triplets
1060
252Convex Holes
660
253Tidying up
802
254Sums of Digit Factorials
750
255Rounded Square Roots
705
256Tatami-Free Rooms
577
257Angular Bisectors
525
258A lagged Fibonacci sequence
1206
259Reachable Numbers
1238
260Stone Game
1034
261Pivotal Square Sums
522
262Mountain Range
566
263An engineers' dream come true
839
264Triangle Centres
459
265Binary Circles
3446
266Pseudo Square Root
1348
267Billionaire
2731
268Counting numbers with at least four distinct prime factors less than 100
1142
269Polynomials with at least one integer root
537
270Cutting Squares
517
271Modular Cubes, part 1
1875
272Modular Cubes, part 2
728
273Sum of Squares
1071
274Divisibility Multipliers
1156
275Balanced Sculptures
479
276Primitive Triangles
850
277A Modified Collatz sequence
2576
278Linear Combinations of Semiprimes
802
279Triangles with integral sides and an integral angle
549
280Ant and seeds
823
281Pizza Toppings
726
282The Ackermann function
762
283Integer sided triangles for which the area/perimeter ratio is integral
526
284Steady Squares
1000
285Pythagorean odds
930
286Scoring probabilities
1690
287Quadtree encoding (a simple compression algorithm)
1131
288An enormous factorial
1281
289Eulerian Cycles
382
290Digital Signature
783
291Panaitopol Primes
1104
292Pythagorean Polygons
467
293Pseudo-Fortunate Numbers
2299
294Sum of digits - experience #23
707
295Lenticular holes
376
296Angular Bisector and Tangent
458
297Zeckendorf Representation
2279
298Selective Amnesia
536
299Three similar triangles
496
300Protein folding
850