static boolean isDihedralPrime ( int n ) {
  if ( ! isPrime [ n ] || ! isPrime [ mirror ( n ) ] || ! isPrime [ reverse ( n ) ] || ! isPrime [ reverse ( mirror ( n ) ) ] ) {
    return false ;
  }
  int temp = n ;
  while ( temp > 0 ) {
    int rem = temp % 10 ;
    if ( rem == 3 || rem == 4 || rem == 6 || rem == 7 || rem == 9 ) {
      return false ;
    }
    temp /= 10 ;
  }
  return true ;
}

static boolean isDihedralPrime ( int n ) { if ( ! isPrime [ n ] || ! isPrime [ mirror ( n ) ] || ! isPrime [ reverse ( n ) ] || ! isPrime [ reverse ( mirror ( n ) ) ] ) { return false ; } int temp = n ; while ( temp > 0 ) { int rem = temp % 10 ; if ( rem == 3 || rem == 4 || rem == 6 || rem == 7 || rem == 9 ) { return false ; } temp /= 10 ; } return true ; }
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