The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A347529 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A347529

Irregular triangle read by rows: T(n,k) is the sum of the subparts of the symmetric representation of sigma(n) that arise from the (2*k-1)-th double-staircase of the double-staircases diagram of n described in A335616, n >= 1, k >= 1, and the first element of column k is in row A000384(k).
(history; published version)

#89 by Peter Luschny at Fri Jun 16 03:17:00 EDT 2023

STATUS

reviewed

approved

#88 by Joerg Arndt at Fri Jun 16 03:02:44 EDT 2023

STATUS

proposed

reviewed

#87 by Michel Marcus at Fri Jun 16 02:41:35 EDT 2023

STATUS

editing

proposed

#86 by Michel Marcus at Fri Jun 16 02:41:28 EDT 2023

COMMENTS

If n is a an even perfect number then there are two nonzero terms in row n, they are T(n,1) = 2*n - 1 and the last term in the row is 1.

STATUS

approved

editing

#85 by N. J. A. Sloane at Thu May 19 15:00:56 EDT 2022

STATUS

proposed

approved

#84 by Omar E. Pol at Thu May 19 11:27:43 EDT 2022

STATUS

editing

proposed

#83 by Omar E. Pol at Thu May 19 11:26:10 EDT 2022

LINKS

<a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>

STATUS

approved

editing

#82 by Peter Luschny at Thu Mar 10 16:42:57 EST 2022

STATUS

proposed

approved

#81 by Omar E. Pol at Thu Mar 10 15:29:53 EST 2022

STATUS

editing

proposed

Discussion

Thu Mar 10

15:30

Omar E. Pol: Subpart.

#80 by Omar E. Pol at Thu Mar 10 15:29:13 EST 2022

COMMENTS

Row n contains a part subpart 1 if and only if n is a hexagonal number.

STATUS

approved

editing

Discussion

Thu Mar 10

15:29

Omar E. Pol: Replaced part with subpat.