The original chip inside the first PC - (by IBM) was Motorola chip serial number 8086. Since the inception of it, chip manufacturers have tried to use the little '86 at the end... PC I was 8186, then came 8286, and so forth. The last chip serialled with '86 was the 486, but since most people associated that '86 with computer power, the next series was named "Pentium" - Intel tried to move off the numbers, and still does so even though we're up to Pentium IV's, they, in truth being 8986's, or 9086 depending on who's chips you're counting.
Huh? It believe you mixed them up. Different numbers, different processors, different vendors.

Below is not an exhaustive list, but it should give some figure:

Intel: 8008, 8080, 8086, 8088 (8-bit version of 8086), 80186 (rarely used), 80286, 80386 (or simply 386), 80486 (or 486), Pentium XX (you know all

Motorola: 6800, 6801, 6803, 6805, 6809, 6809, 68000, 68010, 68020, 68030, 68040, 68060 (680X0 used in old Mac and Mac II), PPC 601, 602, 603, 604 (60X used in old Power Mac)

Peace always,