S2013 E1 • 158,962,555,217,826,360,000

The Nazi's Enigma Machine - and the mathematics behind it - was a crucial part of World War II.

Première diffusion : 10 janvier 2013

S2013 E2 • Flaw in the Enigma Code

The flaw which allowed the Allies to break the Nazi Enigma code.

Première diffusion : 14 janvier 2013

S2013 E3 • Number 1 and Benford's Law

Why number 1 is the "leading digit" more often than you may expect?

Première diffusion : 20 janvier 2013

S2013 E4 • Brady's Videos and Benford's Law

Do the viewing figures on YouTube obey Benford's Law?

Première diffusion : 21 janvier 2013

S2013 E5 • Numbers and Brains

Your brain seems to treat numbers and words very differently (even if the number is written as a word!). So says cognitive neuropsychologist Brian Butterworth.

Première diffusion : 26 janvier 2013

S2013 E6 • End of Time (Unix)

Time will "end" for 32-bit computers on 19 January, 2038.

Première diffusion : 29 janvier 2013

S2013 E7 • The Most Favourite Number

What number is the "most favourite"? We analyse your comments.

Première diffusion : 1 février 2013

S2013 E8 • Dragon Curve

Beautiful Dragon Curves, Fractals and Jurassic Park. Featuring Rob Eastaway.

Première diffusion : 5 février 2013

S2013 E9 • New Largest Known Prime Number

There is a new "largest known prime number".

Première diffusion : 7 février 2013

S2013 E10 • Anatomy of a Goal

A numerical look at a World Cup winning goal. With thanks to the stats gurus at Opta

Première diffusion : 12 février 2013

S2013 E11 • Quick chat with Brady

Brady in his office. Sorry about the computer delivery! :) Join us at 4pm UK time on Feb 14 for a "Numberphile Live" with James Grime

Première diffusion : 13 février 2013

S2013 E12 • Zequals and Estimation

Rob Eastaway on his "zequals" estimation method - ruthless rounding!

Première diffusion : 14 février 2013

S2013 E13 • Meet James Grime

Chatting with Numberphile regular, Dr James Grime. Some links below from the discussion...

Première diffusion : 14 février 2013

S2013 E14 • Pi and the size of the Universe

Pi is famously calculated to trillions of digits - but Dr James Grime says 39 is probably enough

Première diffusion : 20 février 2013

S2013 E15 • Synesthesia

Talking about Grapheme to Colour Synesthesia with Alex from Bite Sci-Zed

Première diffusion : 22 février 2013

S2013 E16 • Dragon Curve to Music

An animated Dragon Curve by Pierre Bernard and music by Alan Stewart.

Première diffusion : 25 février 2013

S2013 E17 • The problem in Good Will Hunting

Just how hard was the second problem cracked by Will in Good Will Hunting? Matt Damon! And who doesn't love Homeomorphically Irreducible Trees?

Première diffusion : 4 mars 2013

S2013 E18 • Who was the REAL Good Will Hunting?

George Dantzig, William Sidis, Srinivasa Ramanujan? Who was the real Good Will Hunting?

Première diffusion : 8 mars 2013

S2013 E19 • Calculating Pi with Real Pies

How accurately can we calculate Pi using hundreds of REAL pies?

Première diffusion : 11 mars 2013

S2013 E20 • How Pi was nearly changed to 3.2

The State of Indiana nearly passed a law which would have made Pi equal 3.2 - strange but true.

Première diffusion : 12 mars 2013

S2013 E21 • Pi with Pies (director's slice)

A 6'28" version of our "Pi with Pies" calculation. While the pies are usually delicious, this batch was not for consumption (even by hungry students, for those who suggested it!) but we feel they were used in a fun way to make people think about mathematics - perhaps some people who would not otherwise take an interest... To mark Pi Day we instead donated £314 to a local charity which helps feed people in crisis.

Première diffusion : 14 mars 2013

S2013 E22 • Problems with French Numbers

French numbers can pose problems for non-native speaker - especially when you move beyond 70. Also discussing problems with phone numbers and commas! Featuring Dr Paul Smith from the University of Nottingham.

Première diffusion : 19 mars 2013

S2013 E23 • 19 out of 20

In French culture, it is traditional for all grades to be out of 20 - and many teachers will NEVER give full marks! Featuring Dr Paul Smith, from the School of Modern Languages and Cultures at the University of Nottingham.

Première diffusion : 19 mars 2013

S2013 E24 • Statistics on Match Day

As promised, we join the Opta team harvesting data from football/soccer matches on match day.

Première diffusion : 21 mars 2013

S2013 E25 • Squaring the Circle

Why was squaring the circle - the old-fashioned way - found to be impossible?

Première diffusion : 25 mars 2013

S2013 E26 • Safe Cracking

A chat about some of the ways legendary physicist Richard Feynman cracked safes (filing cabinets) at Los Alamos during the Manhattan Project. Discussed by Professor Roger Bowley.

Première diffusion : 27 mars 2013

S2013 E27 • Fibonacci Tartan and Bagpipes

Première diffusion : 4 avril 2013

S2013 E28 • Zeno's Paradox

Dr James Grime is back and talking about tortoises.

Première diffusion : 7 avril 2013

S2013 E29 • Random Numbers

Using radioactive material to generate random numbers...

Première diffusion : 10 avril 2013

S2013 E30 • Infinite Primes

How do we know there are an infinite number of primes? Dr James Grime explains, with a bit of help from Euclid.

Première diffusion : 23 avril 2013

S2013 E31 • Numberphile in Nepal

Just a quick one from Brady after his return from Nepal.

Première diffusion : 8 mai 2013

S2013 E32 • Illegal Numbers

Première diffusion : 13 mai 2013

S2013 E33 • Maths Jokes Explained

Some of your favourite maths jokes are dissected in forensic fashion.

Première diffusion : 20 mai 2013

S2013 E34 • Base Number Jokes Explained

Not all jokes are in base 10...

Première diffusion : 20 mai 2013

S2013 E35 • Why 381,654,729 is awesome

Discussing pandigital numbers with Dr James Grime (and a special guest).

Première diffusion : 21 mai 2013

S2013 E36 • Googol Song

Singing a googol - but what about a googolplex? (contains some bleeped swearing) Featuring Helen Arney (http://helenarney.com/) and Matt Parker

Première diffusion : 22 mai 2013

S2013 E37 • Gaps between Primes

An exciting paper about gaps between prime numbers - a step closer to proving the twin prime conjecture.

Première diffusion : 27 mai 2013

S2013 E38 • What colour is 27?

More on number/color synesthesia, including your questions for with Alex Dainis.

Première diffusion : 29 mai 2013

S2013 E39 • Number Trick

Just a quick number trick with Dr James Grime.

Première diffusion : 2 juin 2013

S2013 E40 • Mathematical Music

Alan Stewart makes music for many of Brady's videos, including here on Numberphile. In this video he explains some of his compositions.

Première diffusion : 4 juin 2013

S2013 E41 • Zero Factorial

0! = 1 Dr James Grime tries to explain why this is the case

Première diffusion : 8 juin 2013

S2013 E42 • Transcendental Numbers

Numbers like e and Pi cannot be made using normal algebra. Featuring Australia's Numeracy Ambassador, Simon Pampena.

Première diffusion : 12 juin 2013

S2013 E43 • Is it Math or Maths?

An emotional subject for some - we ask a linguist about Math (US-style) and Maths (British-style).

Première diffusion : 19 juin 2013

S2013 E44 • Cicada 17

Why do cicadas emerge every 17 years - featuring Steve Mould.

Première diffusion : 22 juin 2013

S2013 E45 • One minus one plus one minus one

Discussing the brain-bending Grandi's Series and Thomson's Lamp - featuring Dr James Grime.

Première diffusion : 25 juin 2013

S2013 E46 • Prime Spirals

Prime numbers, Ulam Spirals and other cool numbery stuff with Dr James Grime.

Première diffusion : 9 juillet 2013

S2013 E47 • 41 and more Ulam's Spiral

More on prime numbers and Ulam's Spiral - this time focusing on 41 and Arthur C. Clarke.

Première diffusion : 10 juillet 2013

S2013 E48 • Infinity Paradoxes

Infinity can throw up some interesting paradoxes, from filling Hilbert's Hotel to painting Gabriel's Trumpet... Mark Jago is a philosophy lecturer with a background in computer science. The money game is known as St. Petersburg Paradox - it is quite famous!

Première diffusion : 15 juillet 2013

S2013 E49 • Awesome Prime Number Constant

Have you ever heard of Mills' Constant? Several people have pointed out the n=4 prime is 2521008887 (we missed an 8)

Première diffusion : 18 juillet 2013

S2013 E50 • Six Sequences

Which of these number sequences do you like best?

Première diffusion : 22 juillet 2013