9479 = (2 * 4739) + 1 ;
hence not 2 divides 9479 by NAT_4:9; :: thesis:
9479 = (3 * 3159) + 2 ;
hence not 3 divides 9479 by NAT_4:9; :: thesis:
9479 = (5 * 1895) + 4 ;
hence not 5 divides 9479 by NAT_4:9; :: thesis:
9479 = (7 * 1354) + 1 ;
hence not 7 divides 9479 by NAT_4:9; :: thesis:
9479 = (11 * 861) + 8 ;
hence not 11 divides 9479 by NAT_4:9; :: thesis:
9479 = (13 * 729) + 2 ;
hence not 13 divides 9479 by NAT_4:9; :: thesis:
9479 = (17 * 557) + 10 ;
hence not 17 divides 9479 by NAT_4:9; :: thesis:
9479 = (19 * 498) + 17 ;
hence not 19 divides 9479 by NAT_4:9; :: thesis:
9479 = (23 * 412) + 3 ;
hence not 23 divides 9479 by NAT_4:9; :: thesis:
9479 = (29 * 326) + 25 ;
hence not 29 divides 9479 by NAT_4:9; :: thesis:
9479 = (31 * 305) + 24 ;
hence not 31 divides 9479 by NAT_4:9; :: thesis:
9479 = (37 * 256) + 7 ;
hence not 37 divides 9479 by NAT_4:9; :: thesis:
9479 = (41 * 231) + 8 ;
hence not 41 divides 9479 by NAT_4:9; :: thesis:
9479 = (43 * 220) + 19 ;
hence not 43 divides 9479 by NAT_4:9; :: thesis:
9479 = (47 * 201) + 32 ;
hence not 47 divides 9479 by NAT_4:9; :: thesis:
9479 = (53 * 178) + 45 ;
hence not 53 divides 9479 by NAT_4:9; :: thesis:
9479 = (59 * 160) + 39 ;
hence not 59 divides 9479 by NAT_4:9; :: thesis:
9479 = (61 * 155) + 24 ;
hence not 61 divides 9479 by NAT_4:9; :: thesis:
9479 = (67 * 141) + 32 ;
hence not 67 divides 9479 by NAT_4:9; :: thesis:
9479 = (71 * 133) + 36 ;
hence not 71 divides 9479 by NAT_4:9; :: thesis:
9479 = (73 * 129) + 62 ;
hence not 73 divides 9479 by NAT_4:9; :: thesis:
9479 = (79 * 119) + 78 ;
hence not 79 divides 9479 by NAT_4:9; :: thesis:
9479 = (83 * 114) + 17 ;
hence not 83 divides 9479 by NAT_4:9; :: thesis:
9479 = (89 * 106) + 45 ;
hence not 89 divides 9479 by NAT_4:9; :: thesis:
9479 = (97 * 97) + 70 ;
hence not 97 divides 9479 by NAT_4:9; :: thesis:

end;

then for n being Element of NAT st 1 < n & n * n <= 9479 & n is prime holds
not n divides 9479 by XPRIMET1:50;
hence 9479 is prime by NAT_4:14; :: thesis: