The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A280223 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A280223

Precipice of n: descending by the main diagonal of the pyramid described in A245092, a(n) is the height difference between the n-th level (starting from the top) and the level of the next terrace.
(history; published version)

#50 by N. J. A. Sloane at Thu Dec 31 11:11:15 EST 2020

COMMENTS

The structure of the step stepped pyramid arises after the 90-degree-zig-zag folding of the diagram of the isosceles triangle A237593.

The step stepped pyramid is also one of the 3D-quadrants of the step stepped pyramid described in A244050.

EXAMPLE

Descending by the main diagonal of the step stepped pyramid, for the levels 9, 10 and 11 we have that the next terrace is in the 12th level, so a(9) = 12 - 9 = 3, a(10) = 12 - 10 = 2, and a(11) = 12 - 11 = 1.

Discussion

Thu Dec 31

11:11

OEIS Server: https://oeis.org/edit/global/2881

#49 by N. J. A. Sloane at Sat Mar 11 21:14:57 EST 2017

STATUS

proposed

approved

#48 by Jon E. Schoenfield at Sat Mar 11 20:03:14 EST 2017

STATUS

editing

proposed

#47 by Jon E. Schoenfield at Sat Mar 11 20:03:11 EST 2017

COMMENTS

The terraces at the the n-th level of the pyramid are also the parts of the symmetric representation of sigma(n).

STATUS

approved

editing

#46 by N. J. A. Sloane at Mon Jan 02 04:34:55 EST 2017

STATUS

proposed

approved

#45 by Omar E. Pol at Mon Jan 02 04:25:31 EST 2017

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editing

proposed

#44 by Omar E. Pol at Mon Jan 02 04:25:28 EST 2017

COMMENTS

For more information about the precipices see A277437 and A280295.

STATUS

proposed

editing

#43 by Omar E. Pol at Mon Jan 02 04:23:49 EST 2017

STATUS

editing

proposed

#42 by Omar E. Pol at Mon Jan 02 04:23:45 EST 2017

EXTENSIONS

More terms from Omar E. Pol, Jan 02 2017

STATUS

proposed

editing

#41 by Omar E. Pol at Mon Jan 02 04:23:21 EST 2017

STATUS

editing

proposed