def get_consecutive_num(arr):
    """
    Method to get indices of second number in a pair of consecutive numbers
    Note: solve_90f3ed37 uses this function
    """
    rows = []
    for i in range(len(arr) - 1):
        if (arr[i] + 1) == arr[i + 1]:
            rows.append(arr[i + 1])
    return rows