a (large) first test case
hmmm, threading
finally found out what this function is called!
keep the length of the sum
try and untangle this code
new test for the case I'm using
this is failingm, but the longes-prime-sum-from-start seems to be working ok
conj works the other way round!
fencepost error, how embarassing
test with placeholder expected value
make this more suitable for tail recursion
use loop/recur. code still horrible
update expectation
axe the extra overload
move this code into product
no need to pass this through every time since it's in scope anyway and isn't changing
whitespace