5743 = (2 * 2871) + 1 ;
hence not 2 divides 5743 by NAT_4:9; :: thesis:
5743 = (3 * 1914) + 1 ;
hence not 3 divides 5743 by NAT_4:9; :: thesis:
5743 = (5 * 1148) + 3 ;
hence not 5 divides 5743 by NAT_4:9; :: thesis:
5743 = (7 * 820) + 3 ;
hence not 7 divides 5743 by NAT_4:9; :: thesis:
5743 = (11 * 522) + 1 ;
hence not 11 divides 5743 by NAT_4:9; :: thesis:
5743 = (13 * 441) + 10 ;
hence not 13 divides 5743 by NAT_4:9; :: thesis:
5743 = (17 * 337) + 14 ;
hence not 17 divides 5743 by NAT_4:9; :: thesis:
5743 = (19 * 302) + 5 ;
hence not 19 divides 5743 by NAT_4:9; :: thesis:
5743 = (23 * 249) + 16 ;
hence not 23 divides 5743 by NAT_4:9; :: thesis:
5743 = (29 * 198) + 1 ;
hence not 29 divides 5743 by NAT_4:9; :: thesis:
5743 = (31 * 185) + 8 ;
hence not 31 divides 5743 by NAT_4:9; :: thesis:
5743 = (37 * 155) + 8 ;
hence not 37 divides 5743 by NAT_4:9; :: thesis:
5743 = (41 * 140) + 3 ;
hence not 41 divides 5743 by NAT_4:9; :: thesis:
5743 = (43 * 133) + 24 ;
hence not 43 divides 5743 by NAT_4:9; :: thesis:
5743 = (47 * 122) + 9 ;
hence not 47 divides 5743 by NAT_4:9; :: thesis:
5743 = (53 * 108) + 19 ;
hence not 53 divides 5743 by NAT_4:9; :: thesis:
5743 = (59 * 97) + 20 ;
hence not 59 divides 5743 by NAT_4:9; :: thesis:
5743 = (61 * 94) + 9 ;
hence not 61 divides 5743 by NAT_4:9; :: thesis:
5743 = (67 * 85) + 48 ;
hence not 67 divides 5743 by NAT_4:9; :: thesis:
5743 = (71 * 80) + 63 ;
hence not 71 divides 5743 by NAT_4:9; :: thesis:
5743 = (73 * 78) + 49 ;
hence not 73 divides 5743 by NAT_4:9; :: thesis:

end;

then for n being Element of NAT st 1 < n & n * n <= 5743 & n is prime holds
not n divides 5743 by XPRIMET1:42;
hence 5743 is prime by NAT_4:14; :: thesis: