**A, B, C**) of four-digit decimal primes, with

**A**<

**B**<

**C**, such that:

(i)

**A**,

**B**and

**C**(in this order) are in arithmetic sequence, and:

(ii) Each of

**B**and

**C**is obtained by permuting the digits of

**A**, and:

(iii) None of

**A**,

**B**and

**C**can contain any leading zero.