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Apr 1, 2022 at 14:50 history edited José Hdz. Stgo. CC BY-SA 4.0
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Apr 13, 2019 at 17:11 vote accept Squid with Black Bean Sauce
Apr 11, 2019 at 11:56 history made wiki Post Made Community Wiki by Todd Trimble
Apr 11, 2019 at 6:41 comment added Gerry Myerson Here, anyway, is one failed attempt to find a counterexample: ams.org/journals/mcom/1994-63-207/S0025-5718-1994-1226815-3 Aaron Schlafly and Stan Wagon, Carmichael's conjecture on the Euler function is valid below $ 10^{10,000,000}$, Math. Comp. 63 (1994), 415-419. See also B39 in Guy, Unsolved Problems In Number Theory.
Apr 11, 2019 at 6:38 comment added user21820 @GerryMyerson: Okay thanks for the information!
Apr 11, 2019 at 6:37 comment added Gerry Myerson @user, it is a well-known problem. Since we seldom publish our failures, it is hard to know how many experts may have seriously tried but failed to settle it.
Apr 11, 2019 at 5:55 comment added user21820 Is it a well-known problem that many number theory experts have seriously tried but failed to solve?
Apr 10, 2019 at 23:54 history edited José Hdz. Stgo. CC BY-SA 4.0
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Apr 10, 2019 at 22:15 comment added Gerry Myerson Carmichael followed this up with his 1915 book, Diophantine Analysis, which also had exercises at the end of each chapter.
Apr 10, 2019 at 21:37 history answered José Hdz. Stgo. CC BY-SA 4.0