For the types of notes in your specific enquiry ( "low number" notes with short serial numbers), the general rule for "low numbers" to be significantly worth a premium as low-numbered notes is that the number should have more zeroes in front than numbers at the end. For a 5-serial note series, that means anything higher then 00099 isn't a "low number".
I should also point out that, in general, the more numbers there are in a serial number series, the more of that type of note are likely to be printed, and so the more common the notes are in general. Euro notes (11 digits) are much more common than notes from Saint Helena (6 digits), for instance. Notes with only five serials are likely to be scarce, whatever the serial number is.
As for other types of "fancy numbers", the answer is, in general, "yes" - a longer serial number makes finding a radar, repeater, solid, etc less probable. There's some discussion on the probability of encountering a radar note in this thread.
I should also point out that, in general, the more numbers there are in a serial number series, the more of that type of note are likely to be printed, and so the more common the notes are in general. Euro notes (11 digits) are much more common than notes from Saint Helena (6 digits), for instance. Notes with only five serials are likely to be scarce, whatever the serial number is.
As for other types of "fancy numbers", the answer is, in general, "yes" - a longer serial number makes finding a radar, repeater, solid, etc less probable. There's some discussion on the probability of encountering a radar note in this thread.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis




















