The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A081779

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A081779

Ordered m for which m = k^3*a*b*(a^4 - b^4) determine (unique) solution triples(k,a,b), where k=1,2,3,... and (a,b) are coprime pairs, not both odd (i.e., of opposite parity).
(history; published version)

#14 by Jon E. Schoenfield at Sun May 05 23:48:05 EDT 2024

STATUS

editing

approved

#13 by Jon E. Schoenfield at Sun May 05 23:47:58 EDT 2024

LINKS

N. des Vallieres and F. D'Agay, <a href="http://www.saint-exupery.org/home/inv_math1.htm">Le Probleme du Pharaon</a>.

STATUS

approved

editing

#12 by Giovanni Resta at Thu Nov 21 07:37:35 EST 2019

STATUS

reviewed

approved

#11 by Joerg Arndt at Thu Nov 21 07:34:16 EST 2019

STATUS

proposed

reviewed

#10 by Jean-François Alcover at Thu Nov 21 06:54:52 EST 2019

STATUS

editing

proposed

#9 by Jean-François Alcover at Thu Nov 21 06:52:10 EST 2019

DATA

30, 240, 390, 810, 1020, 1920, 2100, 3120, 3750, 6090, 6480, 7380, 7770, 8160, 10290, 10530, 15360, 16800, 21030, 20130, 21870, 24960, 27540, 30000, 32760, 33390, 39930, 46410, 48720, 48750, 51840, 56700, 59040, 60060, 6266062160, 65280, 65910, 82320, 84240, 94920, 96360

MATHEMATICA

Import["https://oeis.org/A057096/b057096.txt", "Table"][[;; 40, 2]]/2 (* Jean-François Alcover, Nov 21 2019 *)

EXTENSIONS

Corrected and extended by Jean-François Alcover, Nov 21 2019

STATUS

approved

editing

#8 by Jon E. Schoenfield at Sat Jul 29 17:24:27 EDT 2017

STATUS

editing

approved

#7 by Jon E. Schoenfield at Sat Jul 29 17:24:23 EDT 2017

NAME

Ordered m for which m = k^3*a*b*(a^4 - b^4) determine (unique) solution triples(k,a,b), where k=1,2,3,... and (a,b) are coprime pairs, not both odd (i.e. , of opposite parity).

FORMULA

a(n) = A057096(n)/2.

STATUS

approved

editing

#6 by Russ Cox at Sat Mar 31 10:26:01 EDT 2012

AUTHOR

_Lekraj Beedassy (blekraj(AT)yahoo.com), _, Apr 10 2003

Discussion

Sat Mar 31

10:26

OEIS Server: https://oeis.org/edit/global/489

#5 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

KEYWORD

nice,nonn,new

AUTHOR

Lekraj Beedassy (boodhimanblekraj(AT)yahoo.com), Apr 10 2003