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Problems


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