[OneWingedShark]

> However, the other number have no significance and are random.

Interesting; and thank you.
As a CS major I can say that the middle numbers COULD be random and linked in through a relational database.

However given what I know of government coding/numbering schemes, they probably DO have some sequence and are not truly random.

[bvw]

My sons are twins, they each signed up for selective service on or near their birthday in November 2001. Their numbers are close to each other and near to Obama’s. It is a stretch of probability that the twin’s numbers would be so close without the selective service number being a sequence. Thus I logically infer that Obama’s number — if the one given out so far is accurate — was issued in or near November 2001.

[bvw]

To complete the record on this thread, the selective service number I used for Obama is per this email that I have seen on the internet (not exactly carefully sourced, I admit):

Mr. Owens,

Barack Hussein Obama registered at a post office in Hawaii. The effective registration date was September 4, 1980.

His registration number is 61-1125539-1.

Daniel Amon

Public Affairs Specialist

It is that part '1125539' which I suspect is a sequence number.