The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A077021 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A077021

a(n) is the unique odd positive solution y of 2^n = 7x^2 + y^2.
(history; published version)

#29 by Alois P. Heinz at Thu Jul 23 19:20:42 EDT 2020

STATUS

proposed

approved

#28 by Michael De Vlieger at Thu Jul 23 17:28:50 EDT 2020

STATUS

editing

proposed

#27 by Michael De Vlieger at Thu Jul 23 17:28:48 EDT 2020

LINKS

Paul Barry, <a href="https://arxiv.org/abs/2004.04577">On a Central Transform of Integer Sequences</a>, arXiv:2004.04577 [math.CO], 2020.

STATUS

approved

editing

#26 by Michel Marcus at Wed Nov 21 11:35:08 EST 2018

STATUS

reviewed

approved

#25 by Joerg Arndt at Wed Nov 21 10:29:33 EST 2018

STATUS

proposed

reviewed

#24 by Jianing Song at Wed Nov 21 09:38:58 EST 2018

STATUS

editing

proposed

#23 by Jianing Song at Wed Nov 21 09:38:34 EST 2018

CROSSREFS

Cf. A077020 (x).

Cf. A002249, A038198, A060728, A077020.

#22 by Jianing Song at Wed Nov 21 09:37:50 EST 2018

CROSSREFS

Cf. A002249, A038198, A060728, A077020.

a(n) = abs(A002249(n)).

STATUS

proposed

editing

#21 by Jianing Song at Wed Nov 21 09:37:30 EST 2018

STATUS

editing

proposed

#20 by Jianing Song at Wed Nov 21 09:17:27 EST 2018

FORMULA

a(n+12) = abs(A002249(n)). - Artur Jasinski, Oct 05 2008 [With correction by _Jianing Song_, Nov 21 2018]

STATUS

approved

editing

Discussion

Wed Nov 21

09:37

Jianing Song: Note the offset