Live and recent posts from across the Fediverse tagged #recreationalmathematics, aggregated by home.social.
Math nerds doing a math nerd thing and I am totally here for it!
Also, confirms my firm belief that behind every theoretical and practical probabilist lies a childhood with cards, dice, betting and other random-generated fun.
Now, would anyone be interested in signing a lease on an L2 space? :packetcat_wink:
https://www.cbc.ca/radio/asithappens/dice-mystery-board-game-9.7328614
#math #SciencePhysicsandMath #RecreationalMathematics #DiceMaking #TableTop #Probability #Gaming
Just back from measuring our latitude (which I do roughly four times a year) and, for the first time, our longitude.
Latitude was pretty good, got to within about 15 km.
Longitude less good. Got about 6.8 degrees, but the actual value is about 3 degrees.
Wondering what went wrong ... need to think about how to "fix" that.
#Outreach #RecMaths #RecreationalMathematics #Latitude #Longitude #Solstice #Measurement
Or maybe better this tauspider!
#tau
#Mathematics
#mathart
#RecreationalMathematics
I have made a symbol to represent 𝛕 (=2π), it is a scheme of how a circle opens and straightens. In the second figure more steps are added, the curve defined by the endpoints is a cochleoid. Finally the third figure shows a tau spider.
UPDATE: My program found a new personal best most delayed palindromic number!
The 25-digit number 1102320000659911613429286 takes 235 iterations before it becomes a 123-digit palindrome.
This beats a former world record set in 2003 by Jason Doucette involving 233 iterations (source: https://jasondoucette.com/worldrecords.html#Most), and is 58 iterations off from the current world record of 293.
#Math #LychrelNumber #MostDelayedPalindromicNumber #Mathematics #RecMath #RecreationalMathematics
((10^n)-1)*(2/3)-53, a formula resulting in rows of n number of sixes with the last two sixes replaced with the number 13, result in primes for n = 2, 3, 7, 12, 30, 97, 192, 265, 327, 417, 475, 574, 595, 699, 9563, and 9601. :MOULE_Happy:
Update: It's ran for 10 days and hasn't found any other new primes below n = 37000. Stopping the program now!
#Math #Mathematics #PrimeNumbers #RecreationalMath #RecMath #RecreationalMathematics #Primes
Update: New record! After appending random digit after random digit for two days, it eventually found this 31689-digit prime. It's larger than the 148091th number in the Fibonacci sequence, which is also prime.
The tiny white digits on the black background look like TV static when zoomed out!
#Math #Mathematics #PrimeNumbers #Primes #RecreationalMathematics #RecMath
Update: overnight it found a 17828-digit prime number, a new personal best!
I can see why most primes found are found with easy-to-write formulae like (2^p)-1 or (k^2^n)+1. Ttrying to go backwards – coming up with a compact formula to represent a really huge prime made up of random digits like this one, is really tricky.
#Math #Mathematics #PrimeNumbers #Primes #RecreationalMathematics #RecMath
Just for fun, I wrote a Python program to start with a random decimal digit, and keep adding the decimal digit until it reaches a prime number.
I'm excited to share it's found a 10997-digit long prime number, which is my new personal best largest prime! It's larger than the 37th factorial prime (3507!-1) which is 10912 digits.
I'll leave the program running overnight to see if it can find longer ones! :MOULE_Happy:
#Math #Mathematics #PrimeNumbers #Primes #RecreationalMathematics #RecMath
@Ian_G_Simpson Wait, WHAT?! A *published* *polyiamond* puzzle in 19-TWENTY-TWO?! Holy crap! Does the recreational #math community know about this? I feel like I should have heard about this decades ago!
#maths #RecreationalMathematics
TIL there is #RecreationalMathematics, and D. R. Kaprekar was a "recreational mathematician".
Update #3: Big update! I've gone through a huge chunk of my bookmarks and added 116 links to #math-themed resources to my site's links page, mostly sites I've bookmarked while engaging with my current hyperfixation around #PrimeNumbers.
If you're interested in #Googology, #Primes, #DistributedComputing searches for prime numbers, #Factoring, #PrimalityProving, or #RecreationalMathematics, check these out!
"Beetle Escape" from Haoran Chen at #G4G: https://www.youtube.com/watch?v=rdjsGt0byOE
Beetles occupy an infinite quarter-plane grid, except for a triangle at the origin. If they can make horizontal and vertical checkers-style jumps (with the jumped-over beetle removed), how large of a triangle permits one beetle to escape to the origin?
The talk shows that escape is impossible for a diagonal of length 7 or more (using Conway's invariant argument for his soldier probem), but 56 beetles can create an escape for n=6.
Is this the best possible? When it is possible for two or more beetles to escape? What about other shapes cut from the half-plane? Lots of good #RecreationalMathematics here.
Child's (12) maths teacher gave them the "2024 Challenge" - which is the Four Fours challenge (https://en.wikipedia.org/wiki/Four_fours) with the digits 2, 0, 2 & 4.
Of course I had to give it a go. I tried to keep the digits in that order, red formulae are where I failed.
Any corrections or improvements welcome!
The spectre (and friends): aperiodic monotiles *without reflection*
This is very cool! 😎
https://vm.tiktok.com/ZGJxCtuWM/
#mathematics #RecreationalMathematics #tiling #tesselation #AperiodicTiling
About to spend an afternoon on the Union Closed Sets Conjecture.
Anyone else?
#math #RecreationalMathematics #unionclosed #unionclosedconjecture
The #Distance Between #Numbers - #Numberphile
https://www.youtube.com/watch?v=Sgupo9DLMGs&ab_channel=Numberphile
#Math #Maths #Mathematics #Numbers #2Adic #2AdicMetric #RationalNumbers #RealNumbers #Limit #Infinity #Converge #Convergence #Diverge #Divergence #RecreationalMaths #RecreationalMathematics #Axiom #Axioms #Axiomatic
Mathematics Can Be Fun – Yakov Perelman
This one was long pending: Mathematics Can Be Fun by Yakov Perelman
To read and enjoy this book it will suffice to possess a modest knowledge of mathematics, i.e. a knowledge of the rules of arithmetic and elementary geometry. Very few problems require the ability of forming and solving equations, and the simplest at that. The table of contents, as you may see, is quite diversified: the subjects range from a motley collection of conundrums and mathematical stunts to useful practical problems on counting and measuring. The author has done everything to make his book as fresh as possible, avoiding repetition of all that has already appeared in his other works (Tricks and Amusements, Interesting Problems, etc.). The reader will find a hundred or so brain- teasers that have not been included in earlier books. Chapter 6- “Number Giants” -is adapted from one of the authors earlier pamphlets, with four new stories added.
Update: Completely new and very hi-res scan added on 2026-08-02
You can get the book here and here
You can get the book here and here.
Arabic version here.
All credits to the original uploaders.
#algebra #fun #geometry #mathematics #perelman #puzzles #recreationalMathematics #yakovPerelman
