Exemple #1
0
 public static boolean check(long n, int p) {
   BigInteger P = BigInteger.TEN.pow(p), Q = BigInteger.TEN.pow(p - 1);
   BigInteger N = BigInteger.ONE, tmp = BigInteger.valueOf(2);
   while (n > 0) {
     if ((n % 2) == 1) {
       N = N.multiply(tmp);
       N = N.mod(P);
     }
     tmp = tmp.multiply(tmp);
     tmp = tmp.mod(P);
     n >>= 1;
   }
   N = N.divide(Q);
   if (N.equals(BigInteger.ONE) || N.equals(BigInteger.valueOf(2))) return true;
   else return false;
 }
Exemple #2
0
 public static void main(String args[]) throws Exception {
   Scanner cin = new Scanner(System.in);
   BigInteger s, M;
   int p, i;
   while (cin.hasNext()) {
     p = cin.nextInt();
     s = BigInteger.valueOf(4);
     M = BigInteger.ONE;
     M = M.shiftLeft(p).subtract(BigInteger.ONE);
     for (i = 0; i < p - 2; ++i) {
       s = s.multiply(s).subtract(BigInteger.valueOf(2));
       while (s.bitLength() > p) {
         s = s.shiftRight(p).add(s.and(M));
       }
     }
     if (s.compareTo(BigInteger.ZERO) == 0 || s.compareTo(M) == 0) {
       System.out.println(0);
       continue;
     }
     String ans = "";
     while (s.compareTo(BigInteger.ZERO) > 0) {
       long buf = s.mod(BigInteger.valueOf(16)).longValue();
       ans += Integer.toHexString((int) buf);
       s = s.divide(BigInteger.valueOf(16));
     }
     for (i = ans.length() - 1; i >= 0; --i) System.out.print(ans.charAt(i));
     System.out.println();
   }
 }
Exemple #3
0
 public static void num(String str) {
   BigInteger a = new BigInteger(str);
   StringBuffer sb = new StringBuffer("");
   StringBuffer n = new StringBuffer("");
   while (!(a.divide(div).equals(zero))) {
     sb.insert(0, (char) (a.mod(div).intValue() + 96));
     a = a.divide(div);
   }
   sb.insert(0, (char) (a.intValue() + 96));
   for (int i = 0; i < str.length(); i++) {
     if (i % 3 == 0 && i != 0) n.insert(0, ",");
     n.insert(0, str.charAt(str.length() - i - 1));
   }
   while (sb.length() < 22) sb.append(" ");
   System.out.println(sb + "" + n);
 }