There a mixing between "network" and "internet". Although Sept 2 1969 marks the beginning of networked computers, that hardly is the start of the internet, although it was a required step for the internet to appear.

IMHO, Jan 1, 1983 should be day 1, mostly because that's when TCP/IP was adpted.

The day 2 computers 1st comunicated using TCP/IP and through a router should be regarded as the first internet-like communication, and thus this day should mak the birthdate of the internet.

It's a cyclic formula:

"I've you you N x "
equals "I've told you N + 1 x"

So I've told you 1 time
= I've told you 2 times
(here we apply the formula again)
= I've told you 3 times
(and so on, until...)
= I've told you 1,000 times

So If N = N + 1
then N = N + 999

Therefore the formula does work to Sam K !