Online HP-35 Emulator - First scientific pocket calculator from 1972

[John Keith]

(12-30-2023 04:46 PM)EdS2 Wrote:  ... surely getting 10 digits of closeness out of 5 digits of input can't just be a numerical coincidence?

I can't see how the number of digits affects accuracy in this case, the numbers entered are both integers. It is an impressive approximation, on 12-digit calculators it is only off by 18 ULPs.