The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A242666 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A242666

Nonnegative integers of the form -x^2 + 4xy + 3y^2.
(history; published version)

#16 by Wolfdieter Lang at Tue Jan 17 03:32:49 EST 2023

STATUS

editing

approved

#15 by Wolfdieter Lang at Tue Jan 17 03:32:35 EST 2023

COMMENTS

For the subsequence of the numbers with proper representations (gcd(x, y) = 1) see A359476. ~ Wolfdieter Lang, Jan 17 2023

CROSSREFS

Cf. A242662, A359476.

STATUS

approved

editing

#14 by Wolfdieter Lang at Mon Jan 02 16:28:38 EST 2023

STATUS

editing

approved

#13 by Wolfdieter Lang at Mon Jan 02 16:28:04 EST 2023

CROSSREFS

Cf. A242662.

STATUS

approved

editing

Discussion

Mon Jan 02

16:28

Wolfdieter Lang: Cf. A242662 added.

#12 by Michael De Vlieger at Fri Jun 03 18:09:18 EDT 2022

STATUS

proposed

approved

#11 by Jon E. Schoenfield at Fri Jun 03 15:57:11 EDT 2022

STATUS

editing

proposed

#10 by Jon E. Schoenfield at Fri Jun 03 15:57:09 EDT 2022

NAME

Nonnegative integers of the form -x^2 + 4xy + 3y^2.

COMMENTS

Nonnegative numbers of the form 7x^2 - y^2. - Jon E. Schoenfield, Jun 03 2022

STATUS

approved

editing

#9 by N. J. A. Sloane at Sat Jun 07 19:18:56 EDT 2014

STATUS

editing

approved

#8 by N. J. A. Sloane at Sat Jun 07 19:18:53 EDT 2014

LINKS

N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references)

STATUS

approved

editing

#7 by N. J. A. Sloane at Wed Jun 04 23:00:21 EDT 2014

STATUS

editing

approved