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Problems Archives

The problems archives table shows problems 1 to 751. 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
278
702Jumping Flea
134
703Circular Logic II
258
704Factors of Two in Binomial Coefficients
701
705Total Inversion Count of Divided Sequences
359
7063-Like Numbers
423
707Lights Out
198
708Twos are all you need
257
709Even Stevens
610
710One Million Members
790
711Binary Blackboard
280
712Exponent Difference
380
713TurĂ¡n's water heating system
535
714Duodigits
570
715Sextuplet Norms
163
716Grid Graphs
201
717Summation of a Modular Formula
373
718Unreachable Numbers
284
719Number Splitting
1858
720Unpredictable Permutations
257
721High powers of irrational numbers
334
722Slowly converging series
383
723Pythagorean Quadrilaterals
166
724Drone Delivery
303
725Digit sum numbers
717
726Falling bottles
168
727Triangle of Circular Arcs
373
728Circle of Coins
224
729Range of periodic sequence
141
730Shifted Pythagorean Triples
151
731A Stoneham Number
377
732Standing on the shoulders of trolls
175
733Ascending subsequences
337
734A bit of prime
247
735Divisors of $2n^2$
171
736Paths to Equality
177
737Coin Loops
277
738Counting Ordered Factorisations
215
739Summation of Summations
351
740Secret Santa
159
741Binary grid colouring
127
742Minimum area of a convex grid polygon
141
743Window into a Matrix
606
744What? Where? When?
223
745Sum of Squares
587
746A Messy Dinner
215
747Triangular Pizza
164
748Upside down Diophantine equation
253
749Near Power Sums
422
750Optimal Card Stacking
248