just something to make CPU busy

divisible_by_all_numbers.c

#include <stdio.h>
#include <stdlib.h>


int main (int argc, char *argv[])
{
  long from, i, j = 20L;

  if (argc > 1)
    from = atol (argv[1]);
  else
    from = 20L;

  for (i = 1L; j; ++i)
  {
    for (j = from; j > 0L; --j)
      if (i % j)
        break;
  }

  printf ("%ld\n", --i);

  return 0;
}