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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
251Cardano Triplets
1078
252Convex Holes
667
253Tidying up
817
254Sums of Digit Factorials
762
255Rounded Square Roots
712
256Tatami-Free Rooms
585
257Angular Bisectors
530
258A lagged Fibonacci sequence
1237
259Reachable Numbers
1256
260Stone Game
1053
261Pivotal Square Sums
530
262Mountain Range
568
263An engineers' dream come true
839
264Triangle Centres
457
265Binary Circles
3516
266Pseudo Square Root
1374
267Billionaire
2787
268Counting numbers with at least four distinct prime factors less than 100
1156
269Polynomials with at least one integer root
546
270Cutting Squares
514
271Modular Cubes, part 1
1915
272Modular Cubes, part 2
734
273Sum of Squares
1091
274Divisibility Multipliers
1168
275Balanced Sculptures
491
276Primitive Triangles
865
277A Modified Collatz sequence
2638
278Linear Combinations of Semiprimes
820
279Triangles with integral sides and an integral angle
555
280Ant and seeds
828
281Pizza Toppings
740
282The Ackermann function
778
283Integer sided triangles for which the area/perimeter ratio is integral
531
284Steady Squares
1022
285Pythagorean odds
949
286Scoring probabilities
1726
287Quadtree encoding (a simple compression algorithm)
1151
288An enormous factorial
1313
289Eulerian Cycles
384
290Digital Signature
791
291Panaitopol Primes
1130
292Pythagorean Polygons
470
293Pseudo-Fortunate Numbers
2371
294Sum of digits - experience #23
718
295Lenticular holes
375
296Angular Bisector and Tangent
469
297Zeckendorf Representation
2326
298Selective Amnesia
548
299Three similar triangles
497
300Protein folding
869