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Problems


IDDescription / TitleSolved By
251Cardano Triplets
808
252Convex Holes
574
253Tidying up
639
254Sums of Digit Factorials
617
255Rounded Square Roots
587
256Tatami-Free Rooms
482
257Angular Bisectors
443
258A lagged Fibonacci sequence
867
259Reachable Numbers
905
260Stone Game
811
261Pivotal Square Sums
447
262Mountain Range
488
263An engineers' dream come true
659
264Triangle Centres
407
265Binary Circles
2510
266Pseudo Square Root
995
267Billionaire
1933
268Counting numbers with at least four distinct prime factors less than 100
848
269Polynomials with at least one integer root
443
270Cutting Squares
444
271Modular Cubes, part 1
1341
272Modular Cubes, part 2
550
273Sum of Squares
814
274Divisibility Multipliers
915
275Balanced Sculptures
417
276Primitive Triangles
657
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