Create table with string identity column

CREATE TABLE Alpha
(
ID int IDENTITY(0,1),
AlphaID as 'PY'+RIGHT('00'+CONVERT(VARCHAR,ID),3)PERSISTED PRIMARY KEY,
[DESC] VARCHAR(64) DEFAULT(''),
ModifiedDate DATETIME DEFAULT(GETDATE())
)

INSERT Alpha
DEFAULT VALUES
INSERT Alpha
DEFAULT VALUES
INSERT Alpha
DEFAULT VALUES
INSERT Alpha
DEFAULT VALUES
INSERT Alpha
DEFAULT VALUES

SELECT * FROM Alpha

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