The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A084740

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A084740

Least k such that (n^k-1)/(n-1) is prime, or 0 if no such prime exists.
(history; published version)

#118 by Joerg Arndt at Sat Feb 25 06:07:00 EST 2023

STATUS

reviewed

approved

#117 by Michel Marcus at Sat Feb 25 05:21:35 EST 2023

STATUS

proposed

reviewed

#116 by Joerg Arndt at Sat Feb 25 03:38:05 EST 2023

STATUS

editing

proposed

#115 by Joerg Arndt at Sat Feb 25 03:37:31 EST 2023

COMMENTS

More terms: a(135) = 1171, a(142) = 1231, a(174) = 3251, a(230) = 5333, a(244) = 3331, a(259) = 2011, a(284) = 2473, a(318) = 1193, a(333) = 9743, a(360) = 2609; for n up to 360, a(n) is currently unknown only for n = {152, 184, 185, 200, 269, 281, 311, 326, 331}. All other terms up to a(360) are less than 1000. - Eric Chen, Nov 14 2014

a(n) corresponds only to probable primes for n = {51, 91, 174, 230, 244, 259, 284, 333, 360}. - Eric Chen, Nov 14 2014

STATUS

approved

editing

Discussion

Sat Feb 25

03:38

Joerg Arndt: all covered in first link.

#114 by Michel Marcus at Fri Dec 10 05:58:16 EST 2021

STATUS

reviewed

approved

#113 by Hugo Pfoertner at Thu Dec 09 09:33:48 EST 2021

STATUS

proposed

reviewed

#112 by Robert G. Wilson v at Fri Nov 05 10:57:34 EDT 2021

STATUS

editing

proposed

#111 by Robert G. Wilson v at Fri Nov 05 10:56:51 EDT 2021

LINKS

Robert G. Wilson v, <a href="/A084740/a084740_3.txt">Table of known a(n) from n = 2 to 1000</a>

Discussion

Fri Nov 05

10:57

Robert G. Wilson v: Fixed. Thanx.

#110 by Robert G. Wilson v at Fri Nov 05 10:56:23 EDT 2021

LINKS

Robert G. Wilson v, <a href="/A084740/a084740_4.txt">Table of known a(n) from n = 2 to 1000.</a>

STATUS

proposed

editing

#109 by Michel Marcus at Sat Oct 09 12:37:07 EDT 2021

STATUS

editing

proposed