cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A271020 Magic sums of 3 X 3 semimagic squares of triangular numbers whose rows, columns, and at least one of the two main diagonals sum to the same number.

Original entry on oeis.org

49288842, 62620221, 116153046, 128221941, 132479727, 443599581, 563581992, 750128651, 1045377417, 1153997472, 1192317546, 1232221059, 1565505534, 1881096741, 2192812511, 2415153276, 2903826159, 3068390847, 3205548534, 3311993184, 3647394275, 3992396232
Offset: 1

Views

Author

Arkadiusz Wesolowski, Mar 28 2016

Keywords

Links

Crossrefs

Cf. A271021, A271022. Subsequence of A269060.

A271021 Magic sums of 3 X 3 semimagic squares of squares whose rows, columns, and at least one of the two main diagonals sum to the same number.

Original entry on oeis.org

21609, 86436, 194481, 257049, 345744, 540225, 777924, 1028196, 1058841, 1172889, 1382976, 1750329, 2160900, 2313441, 2614689, 3111696, 3651921, 4112784, 4235364, 4691556, 4862025, 5531904, 6245001, 6426225, 7001316, 7800849, 8311689, 8643600, 9253764, 9529569
Offset: 1

Views

Author

Arkadiusz Wesolowski, Mar 28 2016

Keywords

Links

Crossrefs

Cf. A267118, A271020, A271022. Subsequence of A269061. Supersequence of A271022.

A271142 A 3 X 3 semimagic square of odd squares, read by rows.

Original entry on oeis.org

4713241, 182439049, 207158449, 278990209, 76545001, 38775529, 110607289, 135326689, 148376761
Offset: 1

Views

Author

Arkadiusz Wesolowski, Mar 31 2016

Keywords

Comments

Three rows, three columns and one diagonal sum to the same number: 394310739 = A271022(1).

Examples

			The semimagic square is
|---------|---------|---------|
| 4713241 |182439049|207158449|
|---------|---------|---------|
|278990209| 76545001| 38775529|
|---------|---------|---------|
|110607289|135326689|148376761|
|---------|---------|---------|
It is:
|---------|---------|---------|
|  2171^2 | 13507^2 | 14393^2 |
|---------|---------|---------|
| 16703^2 |  8749^2 |  6227^2 |
|---------|---------|---------|
| 10517^2 | 11633^2 | 12181^2 |
|---------|---------|---------|

Links

Crossrefs

Cf. A267118, A271022.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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