The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A229758 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A229758

Triangle T(n,k) = A007953(n) * A007953(k) - A007953(n*k) with 1 <= k <= n.
(history; published version)

#30 by Susanna Cuyler at Fri Apr 30 17:14:11 EDT 2021

STATUS

proposed

approved

#29 by Michel Marcus at Fri Apr 30 17:03:56 EDT 2021

STATUS

editing

proposed

#28 by Michel Marcus at Fri Apr 30 17:03:52 EDT 2021

EXAMPLE

From Indranil Ghosh, Feb 14 2017, : (Start)

TableTriangle:

STATUS

approved

editing

#27 by Bruno Berselli at Wed Feb 15 03:05:32 EST 2017

STATUS

proposed

approved

#26 by Michel Marcus at Tue Feb 14 13:28:39 EST 2017

STATUS

editing

proposed

#25 by Michel Marcus at Tue Feb 14 13:28:33 EST 2017

EXAMPLE

...

STATUS

proposed

editing

#24 by Indranil Ghosh at Tue Feb 14 10:12:24 EST 2017

STATUS

editing

proposed

#23 by Indranil Ghosh at Tue Feb 14 10:09:30 EST 2017

LINKS

Indranil Ghosh, <a href="/A229758/b229758.txt">Rows 1..120 of triangle, flattened</a>

EXAMPLE

From Indranil Ghosh, Feb 14 2017, (Start)

Table:

1: 0,

2: 0, 0,

3: 0, 0, 0,

4: 0, 0, 9, 9,

5: 0, 9, 9, 18, 18,

6: 0, 9, 9, 18, 27, 27,

7: 0, 9, 18, 18, 27, 36, 36,

8: 0, 9, 18, 27, 36, 36, 45, 54,

9: 0, 9, 18, 27, 36, 45, 54, 63, 72,

10: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

11: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

12: 0, 0, 0, 0, 9, 9, 9, 9, 18, 0, 0, 0,

T(12,5) = A007953(12) * A007953(5) - A007953(12 * 5) = 3 * 5 - 6 = 15 - 6 = 9. (End)

STATUS

approved

editing

#22 by Michel Marcus at Tue Apr 26 12:42:29 EDT 2016

STATUS

editing

approved

#21 by Michel Marcus at Tue Apr 26 12:42:16 EDT 2016

LINKS

Eric W. Weisstein, 's World of Mathematics, <a href="http://mathworld.wolfram.com/CastingOutNines.html">Casting Out Nines</a>

STATUS

reviewed

editing