more dull crap

[rone]

In English, the lowest natural number that isn't listed as an interest in LiveJournal is "twenty-six". In digits, it's "153".

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[kodi]

In English, the lowest natural number, taken as a username, that does not lead to a LiveJournal is "twelve," which also produces the best error message:
"If you are twelve, you have a period of 30 days to decide to undelete your journal."

The lowest natural number, taken as a username, that yields "Unknown User" is "thirty."

The lowest (positive) natural number in binary, taken as a username, that yields "Unknown User" is "1010."

"0" is also an unknown user, but I assume it's not allowed.