The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A020506 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A020506

Cyclotomic polynomials at x = -7.
(history; published version)

#19 by OEIS Server at Mon Feb 26 10:26:34 EST 2024

LINKS

Paolo Xausa, <a href="/A020506/b020506_1.txt">Table of n, a(n) for n = 0..1000</a>

#18 by Alois P. Heinz at Mon Feb 26 10:26:34 EST 2024

STATUS

proposed

approved

Discussion

Mon Feb 26

10:26

OEIS Server: Installed first b-file as b020506.txt.

#17 by Paolo Xausa at Mon Feb 26 10:26:05 EST 2024

STATUS

editing

proposed

#16 by Paolo Xausa at Mon Feb 26 10:19:48 EST 2024

LINKS

Paolo Xausa, <a href="/A020506/b020506_1.txt">Table of n, a(n) for n = 0..1000</a>

MATHEMATICA

Join[{-7}, Cyclotomic[Range[50], -7]] (* Paolo Xausa, Feb 26 2024 *)

STATUS

approved

editing

#15 by Peter Luschny at Sun Dec 17 15:38:28 EST 2017

STATUS

proposed

approved

#14 by Jon E. Schoenfield at Sun Dec 17 11:22:54 EST 2017

STATUS

editing

proposed

#13 by Jon E. Schoenfield at Sun Dec 17 11:22:51 EST 2017

NAME

Cyclotomic polynomials at x = -7.

STATUS

proposed

editing

#12 by Michel Marcus at Sun Dec 17 11:20:36 EST 2017

STATUS

editing

proposed

#11 by Michel Marcus at Sun Dec 17 02:16:46 EST 2017

DATA

-7, -8, -6, 43, 50, 2101, 57, 102943, 2402, 117307, 2801, 247165843, 2353, 12111126301, 137257, 6568801, 5764802, 29078814248401, 117993, 1424861898171643, 5649505, 15772610449, 329554457, 3421093417510114543, 5762401, 79787519018560501, 16148168401, 1628413557556843

COMMENTS

Sequence has a(0) = x; see comments in A020501.

PROG

(PARI) a(n) = if(n==0, -7, polcyclo(n, -7)); \\ Michel Marcus, Dec 17 2017

EXTENSIONS

More terms from Michel Marcus, Dec 17 2017

STATUS

approved

editing

#10 by Russ Cox at Fri Mar 30 18:36:22 EDT 2012

AUTHOR

Simon Plouffe (simon.plouffe(AT)gmail.com)

Simon Plouffe

Discussion

Fri Mar 30

18:36

OEIS Server: https://oeis.org/edit/global/212