8 numeric plus one alphanumeric would be 10**8 * 36 = 36 followed by 8 zeros = 3.6 billion (American billion, not old UK billion).
EINs ("SSNs for companies") are 9 digits also. Do they have their own "space" or do they potentially duplicate SSNs? I don't know. They are written differently but that is of course a detail: 12-3456789. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Ken Smith Sent: Tuesday, April 21, 2020 10:39 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: SSN values (was Here we go again) 9 characters with 10 possible values = 10 to the 9th = 999,999,999 aka = 1 billion. Allow one position to be alphanumeric adds what? Does position matter? Thought 10 to the 36th plus 10 to the 8th?? But if allow all alphanumeric = 36 to the 9th = ? =Ken On Tue, Apr 21, 2020 at 1:03 PM Joe Monk <joemon...@gmail.com> wrote: > 9 digits = 999,999,999. There afe only 350,000,000 in the USA. > > Joe ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN