田中実
the conjecture states that formula_12 for "n" &gt; 1. This turned out to be false. The smallest counter-example is "n" = 906150257, found by Minoru Tanaka in 1980. It has since been shown that "L"("n") &gt; 0.0618672 for infinitely many positive integers "n", while it can also be shown via the same methods that "L"("n") &lt; -1.3892783 for infinitely many positive integers "n".