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#include <stdio.h>

int main()
{
 int geht;
 long beginn,currnr,i,currbisnr;
 scanf("%d",&beginn);
 printf("\n\nAb %d gibt es folgende Primzahlen:\n",beginn);
 currnr=beginn;
 
 while(1)
 {
  currbisnr=currnr/2+1;
  geht=1;
  for(i=2; i<=currbisnr; i++)
  {
   if(currnr%i==0)
   {
    geht=0;
   }
  }
  if(geht==1)
  {
   printf("%d\n",currnr);
  }
  currnr++;
 }
}

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#include <stdio.h>
#include <limits.h>

int main()
{
    printf("INT_MAX = %d\n", INT_MAX);
    printf("LONG_MAX = %d\n", LONG_MAX);

	getchar();
}

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#include <stdint.h>
...
int32_t beginn,currnr,i,currbisnr;

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#include <math.h>
...
currbisnr = sqrt((double)currnr);