What is the sum of all the natural numbers? Isn't it just infinity or is it really 1/12? Here we will see 1+2+3+... "will be" 1/12 if you use the Ramanujan summation, which is a way to assign a value to a divergent series.
Check out Bose Integral:    • Zeta function in terms of Gamma funct...  
Check out NOT 1/12,    • Not 1/12  

Sum of 1/n^2 by a Gucci Integral:    • a spectacular solution to the Basel p...  
Sum of n^2,    • how Ramanujan did 1^2+2^2+3^2+...=0  
Ramanujan Summation: https://en.wikipedia.org/wiki/Ramanuj...
Ramanujan summation in detail: https://hal.univcotedazur.fr/hal011...
The sum of all natural numbers:
by 3b1b:    • But what is the Riemann zeta function...  
by Numberphile:    • ASTOUNDING: 1 + 2 + 3 + 4 + 5 + ... =...  
by Mathologer:    • Ramanujan: Making sense of 1+2+3+... ...  

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