Discussion
Sun Jun 23
00:33
Michel Marcus: I wonder something: example says left(34)= 130561 and your file has 34 -> 43691
12:46
Gord Palameta: The file isn't a b-file, it is not the sequence itself. Rather, it seems to be something like an external link, except for some reason the link is hosted on oeis.org itself. Eric Chen created the file in 2015, I merely updated it by adding four additional factors that had been discovered in the meantime. I did not look too closely at the pre-existing state of this article and merely made a minimal update to it. I only took an interest in this a-file because someone posted a link to it in the discussion at https://mersenneforum.org/showthread.php?p=519807&postcount=294
13:17
Michel Marcus: ok I see
EXTENSIONS
Updated "Factorization of Phi_n(2) for n up to 1280" file (for 991, 1213, 1219, 1261) by Gord Palameta, Jun 22 2019
Discussion
Sat Jun 22
23:43
Michel Marcus: Extension is not intended for link entries: if really necessary you could have this information as 1st line of your link
23:45
Michel Marcus: The names on the server cannot be changed: the 1st txt file was a250197.txt, the 2nd was a250197_1.txt, the 3rd is a250197_2.txt, etc ..
LINKS
Eric Chen, Gord Palameta, <a href="/A250197/a250197_12.txt">Factorization of Phi_n(2) for n up to 1280</a>
Gord Palameta, <a href="/A250197/a250197_2.txt">TITLE FOR LINK</a>
Discussion
Sat Jun 22
17:33
Gord Palameta: I replaced a250197_1.txt with a250197_2.txt, which has one additional factor each for the exponents 991, 1213, 1219, 1261, based on the latest version of the Cunningham tables for Table 2-
17:37
Gord Palameta: This file is also linked from A250198 as a250197_1.txt (and perhaps from some other sequences?) If it is not possible to quickly determine which sequences link to it, it may be desirable to leave the file name as a250197_1.txt if possible.
LINKS
Gord Palameta, <a href="/A250197/a250197_2.txt">TITLE FOR LINK</a>
EXTENSIONS
Updated "Factorization of Phi_n(2) for n up to 1280" file (for 991, 1213, 1219, 1261) by Gord Palameta, Jun 22 2019
COMMENTS
Numbers n such that Phi_{2nL(n)}(2) is prime.
Discussion
Mon Mar 02
14:20
N. J. A. Sloane: I assume L is supposed to be L(n), right?
COMMENTS
Phi_n(x) is the n-th cyclotomic polynomial.
Discussion
Mon Mar 02
13:03
N. J. A. Sloane: Eric, I added the definition of Phi_n(x). The third comment line now says: Numbers n such that Phi_{2nL}(2) is prime. What is L ? Did you mean to write L(n) there?
