Tupper's formula is a way to encode some 106 by 17 pictures using one number k, for example:

49932790667390235006810925780144730667086920970723202128025820188112422448853248013915761930483464556355134017845070361006803072732535328765570896616771854041487727670861790300002477702654579875870985483450138587826833172648192309028942474529051678976718347977727635901521352785976482413650034570571098999776199186760370814287019004384092624950892514730954399259539885243921322241518159777104263926442504211715099364527901887270118023434451175608564304647278998357332871172697781368938037248

Original image

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Learn more and decode/encode the pictures: https://keelyhill.github.io/tuppers-formula