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#45 by N. J. A. Sloane at Mon May 29 11:38:08 EDT 2023
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#44 by N. J. A. Sloane at Mon May 29 11:38:06 EDT 2023
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| COMMENTS
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ReverseNumbers k such that reverse(2^k) - 1 is prime.
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| STATUS
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approved
editing
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#43 by Andrew Howroyd at Mon Apr 26 11:57:31 EDT 2021
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#42 by Michel Marcus at Mon Apr 26 11:18:11 EDT 2021
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#41 by Steven Charlton at Mon Apr 26 10:36:59 EDT 2021
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#40 by Steven Charlton at Mon Apr 26 10:36:32 EDT 2021
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| DATA
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2, 3, 13, 21, 347, 1217, 1267, 16459, 100909, 342243
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| EXTENSIONS
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a(10) from Steven Charlton, Apr 26 2021
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| STATUS
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approved
editing
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#39 by N. J. A. Sloane at Tue Mar 23 10:37:36 EDT 2021
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#38 by N. J. A. Sloane at Tue Mar 23 10:37:34 EDT 2021
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| LINKS
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N. J. A. Sloane, <a href="https://www.youtube.com/watch?v=9ogbsh8KuEM">Exciting Number Sequences</a> (video of talk, ), Mar 05 2021.
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| STATUS
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approved
editing
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#37 by N. J. A. Sloane at Tue Mar 23 10:36:36 EDT 2021
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#36 by N. J. A. Sloane at Tue Mar 23 10:36:33 EDT 2021
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| COMMENTS
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If it exists, a(9) > 62000. - Hugo Pfoertner, Feb 20 2021
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| STATUS
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proposed
editing
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