Prime calculator sum(1.0002^n/n, 1, 20000)

[Gil]

Just for your information

Summation from 1 to 20 000
of '1.00002^n/n'

gives on my phone Samsung Galaxy S6
with emulated calculator HP50G
with the EMU48 application:

4'12" (calculator "emulated" / original speed)
and 10.9" (full speed).

Regards,
Gil