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Problems Archives

The problems archives table shows problems 1 to 745. 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
701Random connected area
262
702Jumping Flea
127
703Circular Logic II
250
704Factors of Two in Binomial Coefficients
672
705Total Inversion Count of Divided Sequences
348
7063-Like Numbers
411
707Lights Out
187
708Twos are all you need
243
709Even Stevens
573
710One Million Members
728
711Binary Blackboard
272
712Exponent Difference
368
713TurĂ¡n's water heating system
514
714Duodigits
553
715Sextuplet Norms
162
716Grid Graphs
198
717Summation of a Modular Formula
354
718Unreachable Numbers
274
719Number Splitting
1655
720Unpredictable Permutations
249
721High powers of irrational numbers
312
722Slowly converging series
360
723Pythagorean Quadrilaterals
163
724Drone Delivery
291
725Digit sum numbers
630
726Falling bottles
161
727Triangle of Circular Arcs
349
728Circle of Coins
214
729Range of periodic sequence
135
730Shifted Pythagorean Triples
143
731A Stoneham Number
345
732Standing on the shoulders of trolls
164
733Ascending subsequences
313
734A bit of prime
227
735Divisors of $2n^2$
160
736Paths to Equality
158
737Coin Loops
252
738Counting Ordered Factorisations
197
739Summation of Summations
318
740Secret Santa
150
741Binary grid colouring
109
742Minimum area of a convex grid polygon
119
743Window into a Matrix
497
744What? Where? When?
198
745Sum of Squares
436