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Problems


IDDescription / TitleSolved By
251
Cardano Triplets
723
252
Convex Holes
545
253
Tidying up
580
254
Sums of Digit Factorials
575
255
Rounded Square Roots
548
256
Tatami-Free Rooms
458
257
Angular Bisectors
424
258
A lagged Fibonacci sequence
787
259
Reachable Numbers
796
260
Stone Game
745
261
Pivotal Square Sums
422
262
Mountain Range.
467
263
An engineers' dream come true
610
264
Triangle Centres
394
265
Binary Circles
2214
266
Pseudo Square Root
882
267
Billionaire
1604
268
Counting numbers with at least four distinct prime factors less than 100
776
269
Polynomials with at least one integer root
434
270
Cutting Squares
436
271
Modular Cubes, part 1
1140
272
Modular Cubes, part 2
505
273
Sum of Squares
739
274
Divisibility Multipliers
842
275
Balanced Sculptures
410
276
Primitive Triangles
618
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