A086833

[David Wilson]

Hey, it was a shot in the dark.

However, Frank Adams-Watters observation that:

> There is, of course, a problem with this definition: not every addition chain
> can be put into this form; it assumes that each term adds to the previous term
> (i.e., that we are dealing with a Brauer chain).  12509 is the smallest number
> which does not have a shortest addition chain with this property.

immediately suggests yet another interesting sequence not in the OEIS.

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