The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A238245 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A238245

Positive integers n such that x^2 - 22xy + y^2 + n = 0 has integer solutions.
(history; published version)

#9 by Joerg Arndt at Fri Jan 09 08:01:43 EST 2015

STATUS

reviewed

approved

#8 by Michel Marcus at Fri Jan 09 07:24:51 EST 2015

STATUS

proposed

reviewed

#7 by Alonso del Arte at Thu Jan 08 23:01:31 EST 2015

STATUS

editing

proposed

#6 by Alonso del Arte at Thu Jan 08 23:01:19 EST 2015

CROSSREFS

Cf. A157014 (n = 20), A137881 (n = 104), A077422 (n = 120), A133275 (n = 180).

Cf. A031363, A237350, A084917, A237351, A237599, A237606, A237609, A237610, A236330, A236331, A238240.

STATUS

approved

editing

Discussion

Thu Jan 08

23:01

Alonso del Arte: Migrating A237350 to A084917.

#5 by Bruno Berselli at Thu Feb 20 12:08:04 EST 2014

STATUS

reviewed

approved

#4 by Joerg Arndt at Thu Feb 20 11:09:13 EST 2014

STATUS

proposed

reviewed

#3 by Colin Barker at Thu Feb 20 10:57:36 EST 2014

STATUS

editing

proposed

#2 by Colin Barker at Thu Feb 20 10:56:24 EST 2014

NAME

allocated for Colin BarkerPositive integers n such that x^2 - 22xy + y^2 + n = 0 has integer solutions.

DATA

20, 39, 56, 71, 80, 84, 95, 104, 111, 116, 119, 120, 156, 180, 191, 224, 239, 255, 284, 296, 311, 320, 336, 351, 359, 380, 399, 404, 416, 431, 444, 455, 464, 471, 476, 479, 480, 500, 504, 551, 596, 599, 624, 639, 680, 695, 696, 719, 720, 756, 764, 791, 824

OFFSET

1,1

EXAMPLE

39 is in the sequence because x^2 - 22xy + y^2 + 39 = 0 has integer solutions, for example (x, y) = (2, 43).

CROSSREFS

Cf. A157014 (n=20), A137881 (n=104), A077422 (n=120), A133275 (n=180).

Cf. A031363, A237350, A237351, A237599, A237606, A237609, A237610, A236330, A236331, A238240.

KEYWORD

allocated

nonn

AUTHOR

Colin Barker, Feb 20 2014

STATUS

approved

editing

#1 by Colin Barker at Thu Feb 20 10:52:00 EST 2014

NAME

allocated for Colin Barker

KEYWORD

allocated

STATUS

approved