This number is a prime.
The smallest prime that is the sum of the cubes of first n squarefree numbers: (1^3+2^3+3^3+5^3+...+62^3+65^3+66^3 = 2921623). [Bajpai]
The smallest prime that is the sum of the cubes of first n
squarefree numbers: (1^3+2^3+3^3+5^3+...+62^3+65^3+66^3 =
2921623). [Bajpai]