@avoca @kenshirriff maybe I'm misunderstanding what you said but Intel definitely *did not* skip 486 models. There was a whole line of them that preceded the Pentium. I owned and/or used several of them. They "skipped" 586 as a numbering/naming scheme and went to Pentium, but it was after years of 486 being the top of the line chip.

https://en.m.wikipedia.org/wiki/I486

Apologies if I'm simply misunderstanding you.