PGCD = (3983;1099)
PGCD = (1099;2884) 3983-1099 =2884
PGCD = (1099;1785) 2884-1099 =1785
PGCD = (1099;686) 1785-1099=686
PGCD = (686;413) 1099-686=413
PGCD = (413;273) 686-413=273
PGCD = (273;140) 413-273 =140
PGCD = (140;133) 273-140=133
PGCD = (133;7) 140-133=7
PGCD = (7;126) 126-7=126
PGCD = (7;119) 126-7=119
PGCD = (7;112) 119-7 = 112
PGCD = (7;105) 112-7=105
PGCD = (7;98) 105-7 = 98
PGCD = (7;91) 98-7 = 91
PGCD = (7;84) 91-7 =84
PGCD = (7 ;77) 84-7=77
PGCD = (7;70) 77-7 =70
... J'ai pu de temps alors reflechie, cest très simple !