▁first ▁person ▁to ▁find ▁each ▁error ▁in ▁his ▁published ▁books , ▁whether ▁it ▁be ▁technical , ▁typ ographical , ▁or ▁historical . ▁Kn uth ▁explains ▁that ▁$ 2 . 5 6 , ▁or ▁ 2 5 6 ▁c ents , ▁corresponds ▁to ▁one ▁hex ade c imal ▁doll ar . ▁" Val u able ▁suggestions " ▁are ▁worth ▁ 3 2 ▁c ents , ▁or ▁about ▁ ▁of ▁the ▁errors ▁in ▁the ▁book ▁( 0 . 2 ▁hex ade c imal ▁dollars ▁or ▁ 2 0 ▁hex ade c imal ▁c ents ). ▁In ▁his ▁earlier ▁books ▁a ▁smaller ▁reward ▁was ▁offered . ▁For ▁example , ▁the ▁ 2 nd ▁edition ▁of ▁The ▁Art ▁of ▁Computer ▁Program ming , ▁Volume ▁ 1 , ▁offered ▁$ 2 . 0 0 . ▁ ▁The ▁reward ▁for ▁coding ▁errors ▁found ▁in ▁Kn uth ' s ▁Te X ▁and ▁Meta font ▁programs ▁( as ▁distinguished ▁from ▁errors ▁in ▁Kn uth ' s ▁books ) ▁followed ▁an ▁a uda cious ▁scheme ▁inspired ▁by ▁the ▁Whe at ▁and ▁Ch ess board ▁Problem . ▁It ▁started ▁at ▁$ 2 . 5 6 , ▁and ▁double d ▁every ▁year ▁until ▁it ▁reached ▁$ 3 2 7 . 6 8 . ▁Re cip ients ▁of ▁this ▁" s we ep st akes " ▁reward ▁include ▁Chris ▁Thompson ▁( C amb ridge ) ▁and ▁Bog us ław ▁L . ▁Jack owski ▁( G da ń sk ), ▁and ▁also ▁Peter ▁Bre iten lo hner ▁on ▁ 2 0 ▁March ▁ 1 9 9