const int LED_Pins[4] = {0, 4, 9, 13};  // Pins connected to the LEDs

void setup() {
  // Set LED pins as OUTPUT
    for (int i = 0; i < 4; i++) {
        pinMode(LED_Pins[i], OUTPUT);
          }
          }

          void loop() {
            // Starting from 1, display odd numbers in binary
              for (int number = 1; number <= 15; number += 2) {
                  for (int i = 0; i < 4; i++) {
                        digitalWrite(LED_Pins[i], (number& (1 << (3 - i))) != 0);
                            }
                                delay(1000);  // Delay 1 second
                                  }

                                    // Wait for 2 seconds after reaching 15
                                      delay(2000);
                                      }