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Problems Archives

  • Problem 744 will be accessible in 22 hours, 13 minutes (Sunday, 24th January 2021, 01:00 am)

The problems archives table shows problems 1 to 733. If you would like to tackle the 10 most recently published problems then go to Recent problems.
Click the description/title of the problem to view details and submit your answer.


ID

Description / TitleSolved By
551Sum of digits sequence
418
552Chinese leftovers II
387
553Power sets of power sets
192
554Centaurs on a chess board
201
555McCarthy 91 function
617
556Squarefree Gaussian Integers
210
557Cutting triangles
259
558Irrational base
225
559Permuted Matrices
162
560Coprime Nim
265
561Divisor Pairs
667
562Maximal perimeter
168
563Robot Welders
293
564Maximal polygons
212
565Divisibility of sum of divisors
544
566Cake Icing Puzzle
135
567Reciprocal games I
247
568Reciprocal games II
240
569Prime Mountain Range
359
570Snowflakes
250
571Super Pandigital Numbers
970
572Idempotent matrices
297
573Unfair race
178
574Verifying Primes
238
575Wandering Robots
507
576Irrational jumps
205
577Counting hexagons
1405
578Integers with decreasing prime powers
198
579Lattice points in lattice cubes
134
580Squarefree Hilbert numbers
212
58147-smooth triangular numbers
751
582Nearly isosceles 120 degree triangles
282
583Heron Envelopes
332
584Birthday Problem Revisited
165
585Nested square roots
145
586Binary Quadratic Form
191
587Concave triangle
2761
588Quintinomial coefficients
378
589Poohsticks Marathon
165
590Sets with a given Least Common Multiple
233
591Best Approximations by Quadratic Integers
168
592Factorial trailing digits 2
250
593Fleeting Medians
468
594Rhombus Tilings
167
595Incremental Random Sort
552
596Number of lattice points in a hyperball
319
597Torpids
138
598Split Divisibilities
438
599Distinct Colourings of a Rubik's Cube
270
600Integer sided equiangular hexagons
544