@Arjun
sir...we know expansion of π never ends..
now it may be true that π is computable as we can find its nth digit..within n steps of computation..
but here what we need to do is make a T.M. and give input string as 3.141592....
but in toc we consider only finite length input strings .
but here input itself is infinite length..
even if it has a x-block of 5's we don't know how far .may be infinitely distance away..
anyway...its a infinite string as input. which is not the convention..
so shouldn't it be a NON-R.E. language..???