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Problems


IDDescription / TitleSolved By
251Cardano Triplets
822
252Convex Holes
581
253Tidying up
648
254Sums of Digit Factorials
628
255Rounded Square Roots
600
256Tatami-Free Rooms
492
257Angular Bisectors
446
258A lagged Fibonacci sequence
884
259Reachable Numbers
931
260Stone Game
822
261Pivotal Square Sums
456
262Mountain Range
499
263An engineers' dream come true
674
264Triangle Centres
409
265Binary Circles
2563
266Pseudo Square Root
1026
267Billionaire
1990
268Counting numbers with at least four distinct prime factors less than 100
866
269Polynomials with at least one integer root
450
270Cutting Squares
449
271Modular Cubes, part 1
1372
272Modular Cubes, part 2
556
273Sum of Squares
831
274Divisibility Multipliers
932
275Balanced Sculptures
421
276Primitive Triangles
669
277A Modified Collatz sequence
278Linear Combinations of Semiprimes
279Triangles with integral sides and an integral angle
280Ant and seeds
281Pizza Toppings
282The Ackermann function
283Integer sided triangles for which the area/perimeter ratio is integral
284Steady Squares
285Pythagorean odds
286Scoring probabilities
287Quadtree encoding (a simple compression algorithm)
288An enormous factorial
289Eulerian Cycles
290Digital Signature
291Panaitopol Primes
292Pythagorean Polygons
293Pseudo-Fortunate Numbers
294Sum of digits - experience #23
295Lenticular holes
296Angular Bisector and Tangent
297Zeckendorf Representation
298Selective Amnesia
299Three similar triangles
300Protein folding