primes in arithmetic progression
...that existence of arbitrarily many primes in arithmetic progression was proven in 2004, but it took 75 computers to find an example with 24 primes?
...that <a href="./Existence_theorem" id="mwB2M" rel="mw:WikiLink" title="Existence theorem">existence</a> of arbitrarily many <b id="mwB2Q"><a href="./Primes_in_arithmetic_progression" id="mwB2U" rel="mw:WikiLink" title="Primes in arithmetic progression">primes in arithmetic progression</a></b> was proven in 2004, but it took 75<span id="mwB2Y" typeof="mw:Entity"> </span><a href="./Computer" id="mwB2c" rel="mw:WikiLink" title="Computer">computers</a> to find an example with 24 <a href="./Prime_number" id="mwB2g" rel="mw:WikiLink" title="Prime number">primes</a>?