The 9 Challenge! #Shorts @DrWeselcouch
The 9 Challenge! #Shorts  @DrWeselcouch
Uploaded August 2021 | Updated September 2026, 2 hours ago
Inspired by Mathevengers 6 challenge.
youtu.be/DSUp2udMnm4

For those wondering, phi(n) is the number of numbers less than n that are relatively prime with n and pi(n) is the number of primes less than or equal to n.

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Number Theory Problems: youtube.com/playlist?list=PLscpLh9rN1RfOeiBA6o4YSXtAWF3-3_AT
Multivariable Calculus Problems: youtube.com/playlist?list=PLscpLh9rN1RcdbQLLvRItUxOMRKnbDJaw
Calculus 2 Problems: youtube.com/playlist?list=PLscpLh9rN1RcqIZyidbChYLuMAdZhhEwN
Math and Minecraft: youtube.com/playlist?list=PLscpLh9rN1Rf-dqLO4r3GAwvm1O_xL7D1
Combinatorics Problems: youtube.com/playlist?list=PLscpLh9rN1RfNzyUsA_KzsfQ_k1AR9Ebs
Geometry Problems: youtube.com/playlist?list=PLscpLh9rN1RdFKjA3-vvTL_xG6s3YxB6r
Calculus Problems: youtube.com/playlist?list=PLscpLh9rN1Rcv3XYXq5Z0oXMEOVL-aocI
Linear Algebra Problems: youtube.com/playlist?list=PLscpLh9rN1Rfo0ifw9RZFoJ2Te2jk_pwX
Statistics Problems: youtube.com/playlist?list=PLscpLh9rN1RexwCjV9_1RmfluCTv5HKe1
The 9 Challenge! #ShortsThe Physics of Slow Falling in MinecraftThe extra r in polar coordinatesFunctionsApproximating φ in MinecraftThis Question is Golden! (Hard Optimization Problem)Finding the Solution Set of Ax=b.MatricesShortest Paths - Dijkstras AlgorithmA Perfect Pattern of Perfect SquaresA Dr. Peyam inspired Blackpenredpen inspired Integral.Integration of ln(x) #shorts
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The 9 Challenge! #Shorts

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