Răspuns :
29^31 = 29^30 ×29 = 29^30( 25 + 4) = 5²×29^30 + 2²×29^30 = (5·29^15)² + (2·29^15)²
29^31 = 29^30 ×29 = 29^30( 25 + 4) = 5²*29^30 + 2²*29^30 = (5*29^15)^2 + (2*29^15)^2