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Ulam number

Ulam sequence, Ulam-type sequence
Type of Math Object: 
Major Section: 

Mathematics Subject Classification

11B13 no label found


I can't shake the feeling that I have the wrong undivisibility symbol. I used "\not\vert". In journals I usually see the slash much smaller, sometimes so much so I think I should get trifocals. Or maybe I do have the right symbol as far as the Americans with Disabilities Act is concerned, eh?

try $a\nmid b$, you might need to also add \usepackage{amsmath} to the preamble.

That worked, thank you very much. I didn't need to load any packages, just nmid did the job (amsmath is in the default preamble, if I recall correctly). Thank you very much.

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