It's not a reward check, but Knuth read one of my articles and emailed me about it [0], which I found pretty cool.

[0]: https://tug.org/TUGboat/tb43-3/tb135chernoff-lwc.pdf

The biggest shame of my life is that I had one of these and somehow managed to lose it.

• utopcell

  today at 5:17 PM

  If that's your biggest shame then you must have lived a good life.

  • hbcdbff

    today at 6:35 PM

    Or perhaps a life not lived

    • gradus_ad

      today at 7:55 PM

      This comment may trigger life changing reflection in hundreds or thousands of souls...

      • thih9

        today at 9:09 PM

        I guess only if you value shame? Which is not a given. HN has so many “shameless plug” comments - HN readers for sure qualify as shameless.

• kens

  today at 6:33 PM

  I lost one of mine but Knuth kindly sent me a replacement.

I wondered how you received a real check since Knuth has not been sending out real checks (as you have noted) for some time now, only to see that you explained it in the very first sentence and I had read over it, just like many people read over the error that you found in the first sentence of the book. Nice one! I wonder what the "Infinitely" was replaced with - probably not "Finitely" :)

I had received a check recently and wrote about it too https://news.ycombinator.com/item?id=49286258

The error was saying that "infinitely many alphabets can be generated" but there is a finite number of parameters which have a finite range of values. If Knuth had just written "a humongous number of alphabets" he would be correct.

• JK-Swizzle

  today at 7:52 PM

  If I am reading this right, you can generate 268 435 456 ^ 62 alphabets.

  I would say he could have even gotten away with “functionally infinite number of alphabets”.

  • rawling

    today at 8:24 PM

    Some of the parameters are bools. So somewhere between 2^62 and your figure...

It was a bit more than 25 years ago for me, check #790 for $2.88 DT 33, (143).

Really need to find another error or point of improvement so as to get the digital account --- I've been reading through TAoCP Vol. 4 Fascicle 7 on _Constraint Satisfaction_, but it's been slow going (though I did find out that it is intentional that he not list beginning of chapter quotes in the index).

What a brilliant teaching technique, think of how many people studied his work for bounties that they would never cash.

• dhosek

  today at 5:43 PM

  I’m on the mailing list where errors related to TeX are submitted and the level of scrutiny behind submissions is truly mind-boggling.

  • ryandrake

    today at 6:45 PM

    Honestly, I wish all software were subject to that much scrutiny.

I'm surprised we haven't heard of anyone running an AI on Donald Knuth's books to generate the largest collection of checks in existence...

• gucci-on-fleek

  today at 10:23 PM

  They definitely have; lots of the recent bug reports [0] explicitly acknowledge AI assistance. You can also look at the list of pending bug reports [1] and see how many are from 2026 compared to other years (and it takes many months to get the bug reports enough to add them to this list, so this significantly undercounts things).

  [0]: https://tug.org/pipermail/tex-k/

  [1]: https://tug.org/texmfbug/newbug.html

• WillAdams

  today at 6:25 PM

  He is quite methodical and meticulous --- I doubt that there is much in the training data which isn't already accounted for in his research for his writings.

  I only managed to get one check (for an error and a point of improvement) for _very_ minor points in _Digital Typography_ which was facilitated by my having been fascinated by typography since reading Oscar Ogg's _The 26 Letters_ and his cousin Warren Chappell's _The Living Alphabet_ when I was 8 or so.

• xyst

  today at 8:16 PM

  The next headline will read: "AI pilled vibecoders bankrupt a once prominent computer scientist, the figure will surprise you!"

Awesome! I know the feeling, I have two myself. https://x.com/loginn/status/1367475093719416833

(Hmm maybe I should also write a blogpost about this)

• jll29

  today at 5:58 PM

  I also got one for catching DEK out for claiming "Alan Turing broke the Enigma".

  That claim goes to the Polish cryptoanalyst Marian Rejewski instead, of course (https://en.wikipedia.org/wiki/Marian_Rejewski); what Alan Turing and Tommy Flowers did was automate the breaking, which was important because it had to be done again every day (due to the many combinations of configurations of the Enigma).

• utopcell

  today at 5:19 PM

  I bet the mailing cost was more than 0x$2.00 for Knuth.

Sadly I think this is the end of an era. Someone should probably run an AI fact checker on this and send him the rest of any errors. Or he could change the nature or requirement of the reward, if somehow it can be proved the error could not have been found without a human's effort.

Interesting how no other writers in the field seem to have adopted Knuths' strategy to get their books proofread to the point of being bullet proof.

• chompychop

  today at 6:15 PM

  No other writers have the stature of Knuth. The motivation to proof-read here is not the monetary reward after all.

Just FYI for HN - if there is anyone looking to make big money in the coming years there are no fully signed TAOCP first editions anywhere. You would honestly print so much money if you could get all the first edition volumes signed.

I know a guy (ricbit) who have 4 or more

But what's the most Reward checks anyone has ever held?

• jacquesm

  today at 4:50 PM

  Top entry:

  https://www-cs-faculty.stanford.edu/~knuth/boss.html

  • drfuchs

    today at 9:51 PM

    Well, I'm #4, but it's all from TeX stuff (where I'm kind of a ringer), and not The Art Of Computer Programming. The beyond-amazing Udo Wermuth is also all TeX, I believe, and did it without having a home team advantage; everyone else high on the list looks to be strictly TAOCP.

  • zimpenfish

    today at 5:46 PM

    Is that necessarily accurate?

    > "These account balances reflect only the rewards for errors reported since the beginning of 2006. Many reward checks were issued during 1968--2005, too numerous to mention here."

    There's 20 years on that chart vs 37 not on it.

    Also that's "account balance" rather than "the most Reward checks" which I take to mean "the most [number of] reward checks" -- there's probably a correlation, yes, but [0] shows a variety of ways where check values are non-constant.

    [0] https://en.wikipedia.org/wiki/Knuth_reward_check#Reward_amou...

    • gucci-on-fleek

      today at 10:32 PM

      > Is that necessarily accurate?

      Udo's knowledge of TeX is absolutely stunning, so I would be very surprised if he weren't in first place.

      > There's 20 years on that chart vs 37 not on it.

      The reward values have increased exponentially over the years (I think?), so the older years should be relatively insignificant to the overall balances.

    • jacquesm

      today at 5:54 PM

      There is only one person that can rule that out, but since this is their statement on the subject I would take it as authoritative unless there is a better source.

      You probably have a substantial subset of the people on that list on HN, so it might be possible to recover a chunk of the 'paper era'.

      • blltprfmnk

        today at 6:02 PM

        I received two checks in the very early 2000s and my name isn’t on this list.

        For the record I cashed both and have zero regrets. At the time it definitely felt like the right thing to do as I am not into collecting tokens.

        • BellsOnSunday

          today at 9:21 PM

          Most rock and roll thing I heard today :)

      • zimpenfish

        today at 6:48 PM

        > I would take it as authoritative unless there is a better source.

        I'm not doubting the authority on the balances; it's the correlation to the number of checks I'm querying - high balance doesn't necessarily mean high number of checks, especially since the checks can have different values.

        • jacquesm

          today at 9:44 PM

          I doubt even Knuth has those records, so this is as good as it gets until someone sets off to compile a list of the 'paper past' that has enough proof to back the numbers.

  • dhosek

    today at 5:46 PM

    Although that omits the paper check era.

    My guess for the top slot off the top of my head was actually #4.

  • jdw64

    today at 4:57 PM

    thanks!

i was expecting an article about farming these with claude.

thank god it wasn't that lol

Images weren't loading for me, here's a Wayback Machine link https://web.archive.org/web/20260412143311/https://www.thoma...

• deathanatos

  today at 7:24 PM

  The HN URL is missing the trailing slash; see https://news.ycombinator.com/item?id=50036221

• TimK65

  today at 6:42 PM

  Thank you for this! Images weren't loading for me, either.

• tomhow

  today at 7:28 PM

  We updated the URL to add the slash, thanks!

Can we adjust the URL to have a final trailing slash? The HN URL points to,

  https://www.thomas-huehn.com/knuth-reward-check

  src="./bug-report-knuth-2006.jpg"

  https://www.thomas-huehn.com/bug-report-knuth-2006.jpg

One can infer that the post's URI is like a "directory" of the subresources for the post, including those images; the URL of

  https://www.thomas-huehn.com/knuth-reward-check/

  https://www.thomas-huehn.com/knuth-reward-check/bug-report-knuth-2006.jpg

If the author is here, you might consider redirecting the non-slash to the slash.

> But why will you find me there with the entry “0x$1.20”, i.e. decimal $2.88?

I know Knuth has his own notation here, (it is clearly noted at the bottom of the BOSS page) but 0x1.20 should really be decimal 1.125.

• tomhow

  today at 7:29 PM

  Done, thanks!

[flagged]

True AGI will arrive when an LLM will be able to provide ALL remaining mistakes in Donald Knuth's books. And kill one more amazing thing in the process.