4799 = (2 * 2399) + 1 ;
hence not 2 divides 4799 by NAT_4:9; :: thesis:
4799 = (3 * 1599) + 2 ;
hence not 3 divides 4799 by NAT_4:9; :: thesis:
4799 = (5 * 959) + 4 ;
hence not 5 divides 4799 by NAT_4:9; :: thesis:
4799 = (7 * 685) + 4 ;
hence not 7 divides 4799 by NAT_4:9; :: thesis:
4799 = (11 * 436) + 3 ;
hence not 11 divides 4799 by NAT_4:9; :: thesis:
4799 = (13 * 369) + 2 ;
hence not 13 divides 4799 by NAT_4:9; :: thesis:
4799 = (17 * 282) + 5 ;
hence not 17 divides 4799 by NAT_4:9; :: thesis:
4799 = (19 * 252) + 11 ;
hence not 19 divides 4799 by NAT_4:9; :: thesis:
4799 = (23 * 208) + 15 ;
hence not 23 divides 4799 by NAT_4:9; :: thesis:
4799 = (29 * 165) + 14 ;
hence not 29 divides 4799 by NAT_4:9; :: thesis:
4799 = (31 * 154) + 25 ;
hence not 31 divides 4799 by NAT_4:9; :: thesis:
4799 = (37 * 129) + 26 ;
hence not 37 divides 4799 by NAT_4:9; :: thesis:
4799 = (41 * 117) + 2 ;
hence not 41 divides 4799 by NAT_4:9; :: thesis:
4799 = (43 * 111) + 26 ;
hence not 43 divides 4799 by NAT_4:9; :: thesis:
4799 = (47 * 102) + 5 ;
hence not 47 divides 4799 by NAT_4:9; :: thesis:
4799 = (53 * 90) + 29 ;
hence not 53 divides 4799 by NAT_4:9; :: thesis:
4799 = (59 * 81) + 20 ;
hence not 59 divides 4799 by NAT_4:9; :: thesis:
4799 = (61 * 78) + 41 ;
hence not 61 divides 4799 by NAT_4:9; :: thesis:
4799 = (67 * 71) + 42 ;
hence not 67 divides 4799 by NAT_4:9; :: thesis:

end;

then for n being Element of NAT st 1 < n & n * n <= 4799 & n is prime holds
not n divides 4799 by XPRIMET1:38;
hence 4799 is prime by NAT_4:14; :: thesis: