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    $\begingroup$ Makes me wonder if you'll also find a length-8 run below 10⁸ and a length-9 run below 10⁹. $\endgroup$
    – Oliphaunt
    Commented Mar 14 at 9:12
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    $\begingroup$ The first thing coming to my mind is that you could download a list of prime numbers to generate candidate ranges. Unless you were already doing that. $\endgroup$
    – Oliphaunt
    Commented Mar 14 at 9:20
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    $\begingroup$ @Oliphaunt Update: Searched to $10^9$, didn't even find a length-8 run. $\endgroup$
    – isaacg
    Commented Mar 14 at 21:57
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    $\begingroup$ @DialFrost Added the repository $\endgroup$
    – isaacg
    Commented Mar 15 at 1:44
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    $\begingroup$ If there exists an 8+ run with a prefix consisting of only two digits, with the last two digits being arbitrary, it has to be > 10^14 $\endgroup$ Commented Mar 15 at 5:20