RSA Key spec question

E is 17 in pgp, but often 3 or 65567 elsewhere.  I know why 2**N+1, but is
there anything that should be said about this in the spec?

(Testing 2.6.2 v.s. SSLeay from long ago proved that any value of E worked
in either; But only some could be generated, or would be by default).

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