My Random Number Generator is producing small numbers -

i'm trying create "random" number generator online game.

i want create number purely based on positions , stats of players, , based on small counter increments 1 each step in controller.

here's code create "seed" , function use seed generate random number 0 -> max non-inclusive:

function generate_seed(){     var num = 1;     for(var = 0; < number_of_players; i++){         var prevnum = num;         num++;     }      num+=obj_controller.randstep; //randstep variable gets incremented 1 in controller object each step      //loops through players     with(obj_player){           if(x % 2){num+=x;}         else {num-=x;}          if(y % 2){num+=y;}         else {num-=y;}          if(hp % 2){num+=hp;}         else {num-=hp;}          if(randstep % 2){num+=randstep;}         else {num-=randstep;}      }      return abs(num); }  function random(var max){     //generate synced random number 0 -> max, not include max     var seeder = synced_random_generate();      seeder+= max * 5; //make sure seed greater max      return seeder mod max; } 

the thing is, sort of works, if do: random(20000);

it return small number relative max (20,000).

i've never seen return number greater 3000. strange.

does know what's wrong or possible simpler way generate random number based on player positions/stats , incrementing counter in controller?

found great solution online:

int rand1(int lim) {         static long = 100001;         = (a * 125) % 2796203;         return ((a % lim) + 1); }