We know very well Srinivasa Ramanujan as a great mathematician.
His work in prime numbers is second to none.
He made a unique observation regarding 2019.
The number 2019 is the smallest number that can be written in 6 different ways as the sum of the squares of 3 prime numbers.
(The number 2019 is not a prime number though).
(i) 72 + 112 + 432 = 2019
(ii) 72 + 172 + 412 = 2019
(iii) 132 + 132 + 412 = 2019
(iv) 112 + 232 + 372 = 2019
(v) 172 + 192 + 372 = 2019
(vi) 232 + 232 + 312 = 2019
In the above 7, 11, 13, 17, 19, 23, 31, 37, 41 and 43 are all prime numbers.