Make a longer lenguage program
8437495638205698686671 bytes

This translates to the brainfuck program:

-[&gt;&gt;[&gt;]+[-&gt;[&gt;]+.[&lt;]+&lt;]&lt;-]


Which prints exactly \$231584178474632390847141970017375815706539969331281128078915168015826259279614\$ SOH bytes.

This is calculated by the function

f(n)=2*f(n-1)+n
f(0)=0


with an input of 255.

Explanation:

-[         Loop 255 times
  &gt;&gt;[&gt;]    Move to the end of a series of positive cells (initially empty)
  +        Add one cell to the end
  [-       Loop over each cell 
    &gt;[&gt;]+  Add one cell to the end
    .      Print a SOH byte
    [&lt;]+   Restore current cell
  &lt;]       Move to next cell
&lt;-]        Decrement counter