void setup() {
  // put your setup code here, to run once:
  volatile char *dir=0x30;
  *dir=0xFF;

}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *out=0x31;
  //volatile char number[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67};//without dot
  volatile char number[]={0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xE7};//with dot
  volatile long i,count,j,prime=1;
  for(count=2;count<10;count++){
    for(j=2;j<count;j++){
      if(count%j!=0){
        prime=1;
      }
      else{
        prime=0;
        break;
      }
    }
    if(prime){
      *out=number[count];
  
      for(i=0;i<200000;i++);
      *out=0;
      for(i=0;i<200000;i++);
    }

    
  }
  


}