For all positive integers n, the function rev(n) reverses the digits of n. For example, rev(205) = 502 and rev(12340) = 04321 = 4321. Compute the least positive integer m such that gcd(m, rev(m)) = 13.
If:
2a = 3
3b = 4
4c = 5
5d = 6
Then, find the value of a*b*c*d