SaRuMaN had actually been member number 3 for quite a while before making himself number 1. He explains it in this post:
QUOTE(SaRuMaN @ Jun 26 2005, 05:33 AM) [snapback]699225[/snapback]
The reason there was no member no.1 is because this hasn't always been an Invision Board. On the old YaBB board the first member was a default administrator account, which was lost during the conversion of the database when we moved to Invision Board. Member number 2 managed to register on the first day the board was being tested, just before i registered as SaRuMaN.
Anyway, to prevent any further confusion from this I have taken the liberty of changing my member number to no.1, something I should have done a long time ago.
You can read all about it
here.