Vrijeme: 19:20

In the end it doesn't even matter #5

S koliko znamenaka 9 završava dekadski prikaz sljedećeg broja: (1^2+1+1)\cdot 1! + (2^2+2+1)\cdot 2! + (3^2+3+1)\cdot 3!+ \ldots + (9999^2+9999+1)\cdot 9999!