Lulu ISBN prefix

While a majority of my Lulu ISBNs begin with 978-1-326, why are a few with the prefix 978-1-291?

For instance:

Filipiniana Bibliography, 6x9, softbound, 978-1-291-63945-2

Paul & Berthe / Correspondance 1914-1918, 6x9, hardbound, 978-1-291-91090-2


Koxinga of Taiwan, 6x9, softbound, 978-1-326-57134-4

Yeats and Noh, 6x9, hardbound, 978-1-326-45985-7


  • Those 3 digits after 978-1- are signifiers of the batch of ISBNs we're using. Right now if you use one, it'll be 978-1-365...


    Eventually, those will run out and we'll have to get more, and it'll be a new 3 digit series. 

  • potetjppotetjp Teacher

    Thanks a lot, Paul.

  • Is it possible to reserve an ISBN in which the digit string is a prime number and the sum of the digits is a factor of that prime?


    Because that would be a really cool ISBN....


    (Just kidding, Folks...)

  • Em_PressEm_Press Professor

    Like getting a custom driver's license.

     A citizen of the world.

  • Em_PressEm_Press Professor


     A citizen of the world.

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