9613 = (2 * 4806) + 1 ;
hence not 2 divides 9613 by NAT_4:9; :: thesis:
9613 = (3 * 3204) + 1 ;
hence not 3 divides 9613 by NAT_4:9; :: thesis:
9613 = (5 * 1922) + 3 ;
hence not 5 divides 9613 by NAT_4:9; :: thesis:
9613 = (7 * 1373) + 2 ;
hence not 7 divides 9613 by NAT_4:9; :: thesis:
9613 = (11 * 873) + 10 ;
hence not 11 divides 9613 by NAT_4:9; :: thesis:
9613 = (13 * 739) + 6 ;
hence not 13 divides 9613 by NAT_4:9; :: thesis:
9613 = (17 * 565) + 8 ;
hence not 17 divides 9613 by NAT_4:9; :: thesis:
9613 = (19 * 505) + 18 ;
hence not 19 divides 9613 by NAT_4:9; :: thesis:
9613 = (23 * 417) + 22 ;
hence not 23 divides 9613 by NAT_4:9; :: thesis:
9613 = (29 * 331) + 14 ;
hence not 29 divides 9613 by NAT_4:9; :: thesis:
9613 = (31 * 310) + 3 ;
hence not 31 divides 9613 by NAT_4:9; :: thesis:
9613 = (37 * 259) + 30 ;
hence not 37 divides 9613 by NAT_4:9; :: thesis:
9613 = (41 * 234) + 19 ;
hence not 41 divides 9613 by NAT_4:9; :: thesis:
9613 = (43 * 223) + 24 ;
hence not 43 divides 9613 by NAT_4:9; :: thesis:
9613 = (47 * 204) + 25 ;
hence not 47 divides 9613 by NAT_4:9; :: thesis:
9613 = (53 * 181) + 20 ;
hence not 53 divides 9613 by NAT_4:9; :: thesis:
9613 = (59 * 162) + 55 ;
hence not 59 divides 9613 by NAT_4:9; :: thesis:
9613 = (61 * 157) + 36 ;
hence not 61 divides 9613 by NAT_4:9; :: thesis:
9613 = (67 * 143) + 32 ;
hence not 67 divides 9613 by NAT_4:9; :: thesis:
9613 = (71 * 135) + 28 ;
hence not 71 divides 9613 by NAT_4:9; :: thesis:
9613 = (73 * 131) + 50 ;
hence not 73 divides 9613 by NAT_4:9; :: thesis:
9613 = (79 * 121) + 54 ;
hence not 79 divides 9613 by NAT_4:9; :: thesis:
9613 = (83 * 115) + 68 ;
hence not 83 divides 9613 by NAT_4:9; :: thesis:
9613 = (89 * 108) + 1 ;
hence not 89 divides 9613 by NAT_4:9; :: thesis:
9613 = (97 * 99) + 10 ;
hence not 97 divides 9613 by NAT_4:9; :: thesis:

end;

then for n being Element of NAT st 1 < n & n * n <= 9613 & n is prime holds
not n divides 9613 by XPRIMET1:50;
hence 9613 is prime by NAT_4:14; :: thesis: