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Problems


IDDescription / TitleSolved By
251Cardano Triplets
788
252Convex Holes
582
253Tidying up
616
254Sums of Digit Factorials
628
255Rounded Square Roots
600
256Tatami-Free Rooms
457
257Angular Bisectors
411
258A lagged Fibonacci sequence
855
259Reachable Numbers
896
260Stone Game
788
261Pivotal Square Sums
424
262Mountain Range
466
263An engineers' dream come true
643
264Triangle Centres
410
265Binary Circles
2542
266Pseudo Square Root
996
267Billionaire
1969
268Counting numbers with at least four distinct prime factors less than 100
833
269Polynomials with at least one integer root
451
270Cutting Squares
452
271Modular Cubes, part 1
1343
272Modular Cubes, part 2
526
273Sum of Squares
799
274Divisibility Multipliers
898
275Balanced Sculptures
423
276Primitive Triangles
635
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