The On-Line Encyclopedia of Integer Sequences (OEIS)

Revisions by Russ Cox

(See also Russ Cox's wiki page
and changes approved by Russ Cox)

(Bold, blue-underlined text is an ; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A246966

Decimal expansion of H_2, the analog of Madelung's constant for the planar hexagonal lattice.
(history; published version)

#39 by Russ Cox at Wed Sep 18 10:50:19 EDT 2024

LINKS

Eric Weisstein's MathWorld, <a href="http://mathworld.wolfram.com/MadelungConstants.html">Madelung Constants</a>

KEYWORD

nonn,cons,easy,changed

STATUS

editing

#38 by Russ Cox at Wed Sep 18 10:50:12 EDT 2024

LINKS

Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/MadelungConstants.html">Madelung Constants</a>

STATUS

approved

A131878

a(n) = 7*n^2 + 14*n + 1.
(history; published version)

#14 by Russ Cox at Thu Apr 18 18:58:55 EDT 2024

STATUS

editing

#13 by Russ Cox at Thu Apr 18 18:49:42 EDT 2024

KEYWORD

nonn,changed

STATUS

approved

#12 by Russ Cox at Thu Apr 18 18:49:13 EDT 2024

STATUS

editing

#11 by Russ Cox at Thu Apr 18 18:49:08 EDT 2024

COMMENTS

The original terms listed here were incorrect: 1002 through 8086 were listed as 988 through 8072, consistently 14 lower than the actual values. - ~~

#10 by Russ Cox at Thu Apr 18 18:48:53 EDT 2024

COMMENTS

#9 by Russ Cox at Thu Apr 18 18:42:27 EDT 2024

NAME

Row sums of triangle A131876.

DATA

1, 22, 57, 106, 169, 246, 337, 442, 561, 694, 841, 988, 1163, 1352, 1555, 1772, 2003, 2248, 2507, 2780, 3067, 3368, 3683, 4012, 4355, 4712, 5083, 5468, 5867, 6280, 6707, 7148, 7603, 8072, 8569, 9066, 9577, 10102, 10641

FORMULA

EXTENSIONS

STATUS

approved

A131876

2*A131873 - 1.
(history; published version)

#14 by Russ Cox at Thu Apr 18 15:44:08 EDT 2024

STATUS

editing

#13 by Russ Cox at Thu Apr 18 15:44:05 EDT 2024

DATA

1, 15, 7, 29, 15, 13, 43, 23, 21, 19, 57, 31, 29, 27, 25, 71, 39, 37, 35, 33, 31, 85, 47, 45, 43, 41, 39, 37, 99, 55, 53, 51, 49, 47, 45, 43, 113, 63, 61, 59, 57, 55, 53, 51, 49, 127, 71, 69, 67, 65, 63, 61, 59, 57, 55

EXTENSIONS

STATUS

approved