How to concatenate values of expressions

[enzocreti]

I would suggest to add the feature that not only numbers, but also values of expressions can be concatenated, such as c(M(n+1),M(n)).

[science_man_88]

Have considered that only number pairs with a 0 mod 3 number or two of the same mod 3 can create primes ? That it can be simulated with powers ? That it may just be a waste of space ?

[sean]

Originally Posted by enzocreti

I would suggest to add the feature that not only numbers, but also values of expressions can be concatenated, such as c(M(n+1),M(n)).

I'm opposed to this idea. In the few cases where it might actually be interesting you can construct a more useful algebraic expression of the form M(n+1) * 10^k + M(n) where k is the decimal length of M(n).