The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A006721 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A006721

Somos-5 sequence: a(n) = (a(n-1) * a(n-4) + a(n-2) * a(n-3)) / a(n-5), with a(0) = a(1) = a(2) = a(3) = a(4) = 1.
(history; published version)

#158 by Michael De Vlieger at Wed Sep 25 11:23:47 EDT 2024

STATUS

reviewed

approved

#157 by Joerg Arndt at Wed Sep 25 11:16:47 EDT 2024

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proposed

reviewed

#156 by Robert C. Lyons at Wed Sep 25 11:13:37 EDT 2024

STATUS

editing

proposed

#155 by Robert C. Lyons at Wed Sep 25 11:13:33 EDT 2024

PROG

.... A006721.append(int(divexact(A006721[n-1]*A006721[n-4]+A006721[n-2]*A006721[n-3], A006721[n-5])) ) # Chai Wah Wu, Aug 15 2014

STATUS

approved

editing

#154 by Michael De Vlieger at Tue Sep 10 12:38:18 EDT 2024

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reviewed

approved

#153 by Michel Marcus at Tue Sep 10 12:34:21 EDT 2024

STATUS

proposed

reviewed

#152 by Michael De Vlieger at Tue Sep 10 11:56:03 EDT 2024

STATUS

editing

proposed

#151 by Michael De Vlieger at Tue Sep 10 11:56:01 EDT 2024

LINKS

J. W. E. Harrow and A. N. W. Hone, <a href="https://arxiv.org/abs/2409.00406">Casting more light in the shadows: dual Somos-5 sequences</a>, arXiv:2409.00406 [nlin.SI], 2024. See p. 2.

STATUS

approved

editing

#150 by Andrey Zabolotskiy at Fri Feb 02 07:46:29 EST 2024

STATUS

editing

approved

#149 by Andrey Zabolotskiy at Fri Feb 02 07:46:25 EST 2024

LINKS

S. Fomin and A. Zelevinsky, <a href="https://arxiv.org/abs/math/0104241">The Laurent phenomemonphenomenon</a>, arXiv:math/0104241 [math.CO], 2001.

STATUS

approved

editing