Ok, it's pi. It took some head scratching but I see it fills all criteria. The prime factors of 314 are 2 and 157 which add up to 159 which is the second half of N. Great puzzle thanks.

## Ok, it's pi. It took some

Ok, it's pi. It took some head scratching but I see it fills all criteria. The prime factors of 314 are 2 and 157 which add up to 159 which is the second half of N. Great puzzle thanks.