The function array123(list1) returns True if the sequence of numbers 1, 2, 3 appears in the list somewhere.Examplelist1 = [1, 1, 2, 3, 1]Expected output: True

Sure, here is a Python function that implements the logic you described:

def array123(list1):
    # Convert all elements in the list to string
    list1 = [str(i) for i in list1]
    # Join all elements in the list to form a string
    str1 = ''.join(list1)
    # Check if '123' is in the string
    if '123' in str1:
        return True
    else:
        return False

# Test the function
list1 = [1, 1, 2, 3, 1]
print(array123(list1))  # Expected output: True

This function works by first converting all elements in the list to strings, then joining them together to form a single string. It then checks if the string '123' is in this string. If it is, the function returns True, otherwise it returns False.