General · EdgepediaOctober 3, 20266 min read

Numberphile

Numberphile is a YouTube channel about mathematics and numbers, produced by the video journalist Brady Haran and featuring mathematicians explaining ideas, usually by writing with a marker pen on brown paper.¹^•² Launched in 2011 as one of the channels in Google's original-content program, it has become one of the most-watched informal mathematics channels on the platform, with roughly 4.8 million subscribers and more than 729 million total views.³

Key fact	Detail
Creator	Brady Haran, a video journalist who also makes Periodic Videos (chemistry), Sixty Symbols (physics), Deep Sky Videos (astronomy), Objectivity, and Computerphile¹
Launch	2011; sources give September 15, 2011, November 8, 2011, and November 11, 2011 (see below)⁴^•⁵^•⁶
Format	Conversational interviews in which a mathematician explains one idea on brown wrapping paper; average runtime about 12 minutes²^•⁵
Scale	About 4.77 million subscribers, 816 videos, and 729.55 million views as of a recent vidIQ snapshot³
Backing	Supported by Jane Street, the Ben Delo Foundation, Patreon patrons, and a long-running relationship with MSRI (now the Simons Laufer Mathematical Sciences Institute)¹^•⁴
Podcast	The Numberphile Podcast, started in 2018, carries longer interviews with mathematicians⁷
Recognition	Haran received the 2024 Zeeman Medal for the communication of mathematics from the Institute of Mathematics and its Applications and the London Mathematical Society⁸

Origins

Numberphile began in 2011, when Google commissioned about 100 original YouTube channels to boost traffic to the site it had acquired in 2006, committing up to $100 million to the effort; the roster included celebrity channels as well as one pitched by Brady Haran, an Australian-born video journalist then based in Bristol, England, who had already built the chemistry series Periodic Videos and the physics series Sixty Symbols.⁶^•⁴ Haran recalled that there was hardly any math content on the platform at the time and pitched Numberphile and Deep Sky Videos in a funding application.⁴^•⁹

The launch date is reported differently by different sources. The Math Horizons retrospective states the channel went live on September 15, 2011; a contemporary plus.maths.org article announced the launch for Friday, 11/11/11; and TheTVDB lists the first air date as November 8, 2011.⁴^•⁶^•⁵ The early videos, released rapidly under the terms of the Google grant, were short and often focused on a single number, such as the largest number most handheld calculators can factorialize or the size of a googolplex.⁴

The name was Haran's own invention, a made-up word with a clear meaning. He deliberately avoided "mathematics" and its abbreviations to minimize associations with schoolwork, saying he wanted the channel to seem like "a collection of curios rather than a curriculum."⁴

Format and production

Brown paper. The channel's visual signature is its work surface: presenters introduce terminology, draw diagrams, and perform calculations with a marker pen on sheets of brown wrapping paper. Haran rejected a blackboard as too old-fashioned and a whiteboard as too reflective; viewers who were initially dubious came to expect the paper, and some sheets have been auctioned on eBay for charity.²^•⁴

The filming style is conversational and lightly planned. Presenters explain concepts to Haran, who is typically out of frame, responding extemporaneously to his questions as the camera rolls; Haran describes his preparation as "pretty much no planning."⁴ A Guardian editorial in 2024 described the channel as highbrow content with defiantly low production values, noting that the props are usually a sheet of brown paper and a marker pen and that titles run from "Tau vs Pi Smackdown" to "More on Bertrand's Paradox."¹⁰

Most animations are created by Pete McPartlan and the music is composed by Alan Stewart.¹ In addition to the main channel, extra footage is uploaded to a second channel called Numberphile2.¹

Presenters and institutional backing

The channel's on-screen talent is a rotating cast of mathematicians and other guests. Founding presenters included James Grime, later an associate editor of Math Horizons; repeat presenters include Tony Padilla, Zvezdelina Stankova, Matt Parker, and Holly Krieger, alongside guests such as Roger Penrose, Ron Graham, John Conway, Cédric Villani, and Terence Tao.⁴^•¹¹ Haran maintains a public list of the channel's "stars" since 2011.⁸

A turning point came in 2013, when the channel came to the attention of David Eisenbud, then director of the Mathematical Sciences Research Institute (MSRI, now the Simons Laufer Mathematical Sciences Institute), who saw an opportunity to broaden the institute's outreach. The ongoing relationship provides financial backing and gives Haran ready access to the mathematicians who visit the institute's Berkeley, California, campus; much of the channel's filming subsequently moved to California.⁴ The Patreon page states that MSRI remained the main sponsor and that "the project would not exist without them."¹¹ Current support also comes from the research-based trading company Jane Street and the Ben Delo Foundation, with viewers and Patreon patrons described as the most important supporters.¹

Audience and reach

Haran identifies "the non-math community" as the channel's audience, and presenters have described the aim as making math accessible and interesting to the general public rather than teaching a curriculum.⁴ The channel is widely recommended as enrichment rather than instruction: a New Hampshire Math Circle resource list describes the videos as entertaining 10-to-15-minute pieces accessible to a clever 8th-to-10th grader and a good launching point for deeper investigation, and education guides consistently place Numberphile alongside 3Blue1Brown and Khan Academy as a channel for mathematical ideas and curiosity rather than complete coursework.²^•¹²

Individual videos have reached large audiences. The Guardian reported in 2024 that eleven million people had watched the physicist Roger Bowley discuss Kaprekar's Constant.¹⁰ When the channel passed one million subscribers, Haran marked the milestone with "A Mile of Pi," released on October 22, 2014, in which Matt Parker unfurled a continuous 1.05-mile-long strip of paper bearing the first million digits of pi along an airport runway.⁴ As of a recent vidIQ snapshot the channel had 4.77 million subscribers, 816 videos, 729.55 million total views, and about 2.6 million views in the preceding 28 days.³

The podcast and related projects

In 2018 the franchise expanded with The Numberphile Podcast, a forum for longer-form interviews with mathematicians about their lives and careers; the first episodes featured Hannah Fry, Grant Sanderson of 3Blue1Brown, and Ken Ribet, a mathematician involved in the proof of Fermat's Last Theorem.⁷^•⁴ The podcast is hosted by Haran, updated biweekly, and has featured guests including Terence Tao, Roger Penrose, Timothy Gowers, James Maynard, John Urschel, and Tatiana Toro.¹³^•⁴

Numberphile sits within a larger family of Haran's video projects: Periodic Videos (chemistry), Sixty Symbols (physics), Deep Sky Videos (astronomy), Objectivity (science treasures), Computerphile (computer science), and The Unmade Podcast.¹

Recognition

In 2024 the Institute of Mathematics and its Applications and the London Mathematical Society awarded Haran the Zeeman Medal for the communication of mathematics, a prize named after the British mathematician and popularizer Sir Christopher Zeeman. Haran wrote that the award recognized the Numberphile project, which he called "a very large collaboration of talented people," and gave special mention to animator and editor Pete McPartlan.⁸ A Guardian editorial the same month framed the channel as part of a golden era for science education on the platform.¹⁰ In 2025, asteroid 46925 was named "Bradyharan" by the International Astronomical Union at the request of the Catalina Sky Survey, which submitted the name in recognition of Haran's science videos.⁸

References

Topic: Encyclopedia › Arts and culture › Screen and stage › Film and television › Series and fictional screen worlds › Unscripted, reality, and web-native series › Web-native and streaming-original series › Early English-language web series (1997–mid 2010s)

Initially written Oct 3, 2026 · Reviewed: Oct 25, 2026 · Edited: Oct 15, 2026; Oct 21, 2026; Oct 25, 2026 · Last review: Oct 25, 2026

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