bonjour
n² + ( n + 1)² + ( n + 2)² = 9 077
n² + n² + 2 n + 1 + n² + 4 n + 4 = 9 077
3 n² + 6 n + 5 - 9 077 = 0
3 n² + 6 n - 9 072 = 0
Δ = 36 - 4 ( 3 * - 9 072) = 36 + 108 864 = 108 900 = 330 ²
x 1 = ( - 6 - 330) / 6 = - 336/6 = - 56
x 2 = ( - 6 + 330 ) / 6 = 54
54²+ 55 ² +56 ² = 9 077