The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A245512 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A245512

Records in A245511: smallest m > 1 such that the largest odd number less than m^k is prime for every 0 < k < n, but not for k = n.
(history; published version)

#31 by Alois P. Heinz at Sun Sep 18 16:55:14 EDT 2022

STATUS

proposed

approved

#30 by Kellen Shenton at Sun Sep 18 16:52:56 EDT 2022

STATUS

editing

proposed

#29 by Kellen Shenton at Sun Sep 18 16:52:50 EDT 2022

DATA

2, 4, 5, 9, 279, 15331, 1685775, 205670529, 129734299239, 148778622108171

EXTENSIONS

a(10) from Kellen Shenton, Sep 18 2022

STATUS

approved

editing

#28 by N. J. A. Sloane at Thu Sep 15 11:45:54 EDT 2022

STATUS

proposed

approved

#27 by Jeppe Stig Nielsen at Wed Sep 14 12:47:33 EDT 2022

STATUS

editing

proposed

#26 by Jeppe Stig Nielsen at Wed Sep 14 02:36:08 EDT 2022

COMMENTS

For n > 2, a(n) is always odd, because A245511(i) can exceed 2 only when i is odd. Therefore to find more terms, it suffices to find odd bases m such that m-2, m^2-2, m^3-2, m^4-2, ..., m^N-2 is a long list of primes. - Jeppe Stig Nielsen, Sep 14 2022

STATUS

approved

editing

#25 by Joerg Arndt at Wed Sep 14 02:03:33 EDT 2022

STATUS

reviewed

approved

#24 by Michel Marcus at Tue Sep 13 23:46:56 EDT 2022

STATUS

proposed

reviewed

#23 by Kellen Shenton at Tue Sep 13 21:59:23 EDT 2022

STATUS

editing

proposed

#22 by Kellen Shenton at Tue Sep 13 21:59:16 EDT 2022

DATA

2, 4, 5, 9, 279, 15331, 1685775, 205670529, 129734299239

EXTENSIONS

a(9) from Kellen Shenton, Sep 13 2022

STATUS

approved

editing