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Revision History for A066541

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A066541

Number of normal subgroups of the group GL(2,Z_n) of invertible 2 X 2 matrices mod n (sequence A000252).
(history; published version)

#9 by Michel Marcus at Thu Jul 05 02:09:15 EDT 2018

STATUS

reviewed

approved

#8 by Joerg Arndt at Thu Jul 05 01:53:45 EDT 2018

STATUS

proposed

reviewed

#7 by Andrew Howroyd at Wed Jul 04 20:42:49 EDT 2018

STATUS

editing

proposed

#6 by Andrew Howroyd at Wed Jul 04 20:36:06 EDT 2018

CROSSREFS

#5 by Andrew Howroyd at Wed Jul 04 20:00:36 EDT 2018

	DATA	`1, 3, 5, 12, 6, 17, 8, 46, 14, 22, 8, 82, 12, 28, 38, 112, 10, 48, 12, 116, 48, 28, 8, 386, 18, 44, 27, 140, 12, 162, 16, 232, 48, 38, 64, 234, 18, 42, 76, 596, 16, 196, 16, 140, 108, 28, 8, 1022, 24, 66, 66, 232, 12, 93, 64, 680, 72, 44, 8, 1032, 24, 56, 204`
	LINKS	`Andrew Howroyd, <a href="/A066541/b066541.txt">Table of n, a(n) for n = 1..100</a>`
	PROG	`(GAP) Concatenation([1], List([2..20], n->Size(NormalSubgroups(GL(2, Integers mod n))))); # Andrew Howroyd, Jul 04 2018`
	KEYWORD	`nonn,more` `nonn`
	EXTENSIONS	`Terms a(16) and beyond from Andrew Howroyd, Jul 04 2018`
	STATUS	`approved` `editing`

#4 by Bruno Berselli at Tue Oct 31 12:34:50 EDT 2017

STATUS

proposed

approved

#3 by Michel Marcus at Tue Oct 31 12:11:39 EDT 2017

STATUS

editing

proposed

#2 by Michel Marcus at Tue Oct 31 12:11:35 EDT 2017

KEYWORD

nonn,more

STATUS

approved

editing

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

	NAME	`Number of normal subgroups of the group GL(2,Z_n) of invertible 2 X 2 matrices mod n (sequence A000252).`
	DATA	`1, 3, 5, 12, 6, 17, 8, 46, 14, 22, 8, 82, 12, 28, 38`
	OFFSET	`1,2`
	CROSSREFS	`Cf. A066514.`
	KEYWORD	`nonn`
	AUTHOR	`Sharon Sela (sharonsela(AT)hotmail.com), Jan 07 2002`
	STATUS	`approved`

Last modified September 12 18:10 EDT 2024. Contains 375853 sequences. (Running on oeis4.)