Link of the coding problems:
https://projecteuler.net/problem=359
https://codeforces.com/contest/1344/problem/A
Latest developments:
https://ijrpr.com/uploads/V4ISSUE3/IJRPR10757.pdf
https://www.researchgate.net/publication/264089674_Hilbert's_Grand_Hotel_with_a_series_twist
About the Mathematician:
https://en.wikipedia.org/wiki/David_Hilbert
https://studiousguy.com/david-hilberts-contributions-in-mathematics/
Abstract and Introduction:
https://en.wikipedia.org/wiki/Hilbert%27s_paradox_of_the_Grand_Hotel
https://plus.maths.org/content/hilberts-hotel
https://owlcation.com/stem/Hilberts-Paradox-of-the-Grand-Hotel-Another-Look-at-Infinity
https://www.youtube.com/watch?v=OxGsU8oIWjY
Exisiting Resources:
https://en.wikipedia.org/wiki/Georg_Cantor
https://en.wikipedia.org/wiki/Cantor%27s_first_set_theory_article