Base-dependent integer sequences

Repunit

In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit. The term stands for repeated unit and was coined in 1966 by in his book Recreations in the Theory of Numbers. A repunit prime is a repunit that is also a prime number. Primes that are repunits in base-2 are Mersenne primes. As of March 2022, the largest known prime number 282,589,933 − 1, the largest probable prime R8177207 and the largest elliptic curve primality prime R49081 are all repunits. (Wikipedia).

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Clojure - the Reader and Evaluator (4/4)

Part of a series teaching the Clojure language. For other programming topics, visit http://codeschool.org

From playlist the Clojure language

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Eteinne Farcot - The Multiradial Represenation of IUT

http://www.nottingham.ac.uk/cmmb/people/etienne.farcot

From playlist Mathematical Shenanigans

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Clojure - the Reader and Evaluator (2/4)

Part of a series teaching the Clojure language. For other programming topics, visit http://codeschool.org

From playlist the Clojure language

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Underactive thyroid.mov

An general explanation of the underactive thyroid.

From playlist For Patients

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Trigonometry 8 The Tangent and Cotangent of the Sum and Difference of Two Angles.mov

Derive the tangent and cotangent trigonometric identities.

From playlist Trigonometry

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Primes without a 7 - Numberphile

James Maynard discusses his proof that infinite primes exist missing each base 10 digit - he uses 7 as his arbitrary example. More links & stuff in full description below ↓↓↓ More videos with James Maynard: http://bit.ly/JamesMaynard The paper on primes with restricted digits: https://ar

From playlist James Maynard on Numberphile

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Rearrange a series

In this video, I define what it means to rearrange (or reshuffle) a series and show that if a series converges absolutely, then any rearrangement of the series converges to the same limit. Interesting Consequence: https://youtu.be/Mw7ocynGVmw Series Playlist: https://www.youtube.com/play

From playlist Series

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What is Set Subtraction?

What is set subtraction? In this video we go over that, the set minus set operation, and an example of subtraction in set theory. This is a handy concept to grasp to understand the complement of a set and universal sets, which I also have videos on. Links below. I hope you find this vide

From playlist Set Theory

Related pages

Perfect power | Binary number | Integer factorization | Probable prime | Recreational mathematics | Logarithm | Goormaghtigh conjecture | Number | Permutation | Permutable prime | Repdigit | D. R. Kaprekar | Negative base | Wagstaff prime | Aurifeuillean factorization | E (mathematical constant) | Elliptic curve primality | Largest known prime number | Feit–Thompson conjecture | All one polynomial | Coprime integers | Base (exponentiation) | Mersenne prime | Divisibility sequence | Prime power | Nth root | Repeating decimal | Prime number | Cyclotomic polynomial | Prime number theorem | Decimal | Édouard Lucas | Carmichael function