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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A062577 Numbers k such that 11^k - 10^k is prime. 6 3, 5, 19, 311, 317, 1129, 4253, 7699, 18199, 35153, 206081 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 COMMENTS Terms greater than 1000 may correspond to unproven strong pseudoprimes. LINKS Table of n, a(n) for n=1..11. Top probable primes of the form 11^p-10^p PROG (PARI) is(n)=ispseudoprime(11^n-10^n) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A000043, A057468, A059801, A059802, A062572-A062666. Sequence in context: A291920 A172058 A303937 * A144743 A171862 A231627 Adjacent sequences: A062574 A062575 A062576 * A062578 A062579 A062580 KEYWORD nonn,hard AUTHOR Mike Oakes, May 18 2001, May 19 2001 EXTENSIONS Two more terms 18199 and 35153 from Jean-Louis Charton, Sep 02 2009 New term 206081 found by Jean-Louis Charton in October 2011 Edited by M. F. Hasler, Sep 16 2013 STATUS approved

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Last modified July 28 06:13 EDT 2024. Contains 374676 sequences. (Running on oeis4.)