
theorem
  3671 is prime
proof
  now
    3671 = 2*1835 + 1; hence not 2 divides 3671 by NAT_4:9;
    3671 = 3*1223 + 2; hence not 3 divides 3671 by NAT_4:9;
    3671 = 5*734 + 1; hence not 5 divides 3671 by NAT_4:9;
    3671 = 7*524 + 3; hence not 7 divides 3671 by NAT_4:9;
    3671 = 11*333 + 8; hence not 11 divides 3671 by NAT_4:9;
    3671 = 13*282 + 5; hence not 13 divides 3671 by NAT_4:9;
    3671 = 17*215 + 16; hence not 17 divides 3671 by NAT_4:9;
    3671 = 19*193 + 4; hence not 19 divides 3671 by NAT_4:9;
    3671 = 23*159 + 14; hence not 23 divides 3671 by NAT_4:9;
    3671 = 29*126 + 17; hence not 29 divides 3671 by NAT_4:9;
    3671 = 31*118 + 13; hence not 31 divides 3671 by NAT_4:9;
    3671 = 37*99 + 8; hence not 37 divides 3671 by NAT_4:9;
    3671 = 41*89 + 22; hence not 41 divides 3671 by NAT_4:9;
    3671 = 43*85 + 16; hence not 43 divides 3671 by NAT_4:9;
    3671 = 47*78 + 5; hence not 47 divides 3671 by NAT_4:9;
    3671 = 53*69 + 14; hence not 53 divides 3671 by NAT_4:9;
    3671 = 59*62 + 13; hence not 59 divides 3671 by NAT_4:9;
  end;
  then for n being Element of NAT st 1 < n & n*n <= 3671 & n is prime
  holds not n divides 3671 by XPRIMET1:34;
  hence thesis by NAT_4:14;
end;
