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Problems Archives

The problems archives table shows problems 1 to 745. 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.


ID

Description / TitleSolved By
251Cardano Triplets
1296
252Convex Holes
782
253Tidying up
958
254Sums of Digit Factorials
897
255Rounded Square Roots
805
256Tatami-Free Rooms
688
257Angular Bisectors
636
258A lagged Fibonacci sequence
1498
259Reachable Numbers
1414
260Stone Game
1230
261Pivotal Square Sums
637
262Mountain Range
662
263An engineers' dream come true
961
264Triangle Centres
524
265Binary Circles
4027
266Pseudo Square Root
1588
267Billionaire
3215
268Counting numbers with at least four distinct prime factors less than 100
1361
269Polynomials with at least one integer root
641
270Cutting Squares
604
271Modular Cubes, part 1
2243
272Modular Cubes, part 2
896
273Sum of Squares
1282
274Divisibility Multipliers
1333
275Balanced Sculptures
559
276Primitive Triangles
1016
277A Modified Collatz sequence
3064
278Linear Combinations of Semiprimes
977
279Triangles with integral sides and an integral angle
663
280Ant and seeds
964
281Pizza Toppings
896
282The Ackermann function
929
283Integer sided triangles for which the area/perimeter ratio is integral
595
284Steady Squares
1184
285Pythagorean odds
1121
286Scoring probabilities
2015
287Quadtree encoding (a simple compression algorithm)
1351
288An enormous factorial
1551
289Eulerian Cycles
454
290Digital Signature
913
291Panaitopol Primes
1349
292Pythagorean Polygons
535
293Pseudo-Fortunate Numbers
2794
294Sum of digits - experience #23
848
295Lenticular holes
421
296Angular Bisector and Tangent
541
297Zeckendorf Representation
2653
298Selective Amnesia
628
299Three similar triangles
578
300Protein folding
1030