Amazing Prime Numbers

Even if any number is deleted from these prime numbers,  these numbers will still remain prime.

23, 37, 53,73,113,131,137,173,179, 197, 311, 317,431, 617,719, 1499, 1997, 2239, 2293, 3137, 4919, 6173, 7433, 9677, 19973, 23833, 26833, 47933 ......




Examples:

23  -   If 2 is deleted, 3 is a prime, If 3 is deleted 2 is a prime.
137 - If 1 is deleted, 37  is prime, if 3 is deleted, 17 is prime, if 7 is deleted 13 is also a prime number.