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#38 by Joerg Arndt at Mon Jan 31 03:06:40 EST 2022
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#37 by Michel Marcus at Mon Jan 31 02:46:12 EST 2022
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#36 by Jon E. Schoenfield at Mon Jan 31 01:41:34 EST 2022
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#35 by Jon E. Schoenfield at Mon Jan 31 01:41:32 EST 2022
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| NAME
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a(1)=3, b(n)=) = Product_{k=1..n} a(k), a(n+1)=) is the largest prime factor of (b(n)-1.).
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| COMMENTS
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a(15) requires completing the factorization: 13 * 67 * 14479 * 167197 * 924769 * 2688244927 * 888838110930755119 * 14372541055015356634061816579965403 * C211 where C211=6609133306626483634448666494646737799624640616060730302142187545405582531010390290502001156883917023202671554510633460047901459959959325342475132778791495112937562941066523907603281586796876335607258627832127303 [From _. - _Sean A. Irvine_, Nov 10 2009]
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| AUTHOR
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_N. J. A. Sloane_._
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| EXTENSIONS
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a(14) from Joe K. Crump (joecr(AT)carolina.rr.com), Jul 26, 2000
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| STATUS
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approved
editing
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#34 by Charles R Greathouse IV at Tue Apr 07 10:00:52 EDT 2020
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#33 by Charles R Greathouse IV at Tue Apr 07 10:00:49 EDT 2020
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| KEYWORD
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nonn,nice,hard
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| STATUS
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approved
editing
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#32 by Sean A. Irvine at Sun Jul 21 17:38:19 EDT 2019
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#31 by Hugo Pfoertner at Sun Jul 21 17:06:17 EDT 2019
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#30 by Hugo Pfoertner at Sun Jul 21 17:04:14 EDT 2019
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| LINKS
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<a href="http://factordb.com/index.php?id=1100000000216023476">Status of a(15) in factordb.com</a>.
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| STATUS
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approved
editing
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#29 by N. J. A. Sloane at Thu Jun 29 19:27:37 EDT 2017
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