The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A227972 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A227972

Two column recursive array A(n,k), relating expressions based on half-squares (A007590) to each other and several other sequences, read by rows.
(history; published version)

#41 by Michel Marcus at Fri Jul 26 02:27:12 EDT 2024

STATUS

reviewed

approved

#40 by Andrew Howroyd at Fri Jul 26 00:11:01 EDT 2024

STATUS

proposed

reviewed

#39 by Jason Yuen at Thu Jul 25 22:14:45 EDT 2024

STATUS

editing

proposed

#38 by Jason Yuen at Thu Jul 25 22:14:25 EDT 2024

COMMENTS

NOTE: Interleaving of A005319 and A078570 A075870 is A052542 = 2*A000129 (Pell)

STATUS

approved

editing

#37 by Joerg Arndt at Tue Jan 16 02:38:22 EST 2018

STATUS

reviewed

approved

#36 by Wesley Ivan Hurt at Mon Jan 15 16:00:33 EST 2018

STATUS

proposed

reviewed

#35 by Jon E. Schoenfield at Mon Jan 15 15:10:06 EST 2018

STATUS

editing

proposed

#34 by Jon E. Schoenfield at Mon Jan 15 15:10:03 EST 2018

COMMENTS

The value of half the row sum, for n mod 3 = 2, produces A001109 (without its initial 0). This sub-sequence subsequence is also produced from finding the integer square roots of A083374. The value of the indices of that sequence where these roots occur is given by A002315 (NSW Numbers).

EXAMPLE

n (SQRTsqrt) (m) Row Sum Expression

STATUS

approved

editing

#33 by Joerg Arndt at Wed Sep 04 09:59:45 EDT 2013

STATUS

proposed

approved

#32 by Michael Somos at Wed Sep 04 09:57:10 EDT 2013

STATUS

editing

proposed