I had great fun chatting on the live call (despite how tired my brain was) 
Here are a few links to things Ben and I were chatting about for anyone interested:
WolframAlpha: https://www.wolframalpha.com/
Symbolab: https://www.symbolab.com/
All the Numbers - Numberphile: https://www.youtube.com/watch?v=5TkIe60y2GI
Irrational Numbers: https://www.mathsisfun.com/irrational-numbers.html
The Tau Manifesto: https://tauday.com/tau-manifesto
Euler’s Identity: https://plus.maths.org/content/maths-minute-eulers-identity
The Golden Ratio (why it is so irrational) - Numberphile: https://www.youtube.com/watch?v=sj8Sg8qnjOg
Composite Numbers: http://mathworld.wolfram.com/CompositeNumber.html
The sieve of Eratosthenes: https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes#/media/File:Sieve_of_Eratosthenes_animation.gif
(We didn’t explicitly cover this, but it’s a simple way to identify prime numbers)
The sum of three cubes: https://en.wikipedia.org/wiki/Sums_of_three_cubes
And to end, here are some nice quotes on why maths is awesome!
“Mathematics, rightly viewed, possesses not only truth, but supreme beauty” - Bertrand Russell
“Pure mathematics is, in its way, the poetry of logical ideas.” - Albert Einstein
“Mathematics is a place where you can do things which you can’t do in the real world.” - Marcus du Sautoy