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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.

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A317291 Numbers k not in A239019 such that A177894(k) = 0.

Original entry on oeis.org

0, 1001, 1012, 1023, 1034, 1045, 1056, 1067, 1078, 1089, 1100, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 1210, 1221, 1232, 1243, 1254, 1265, 1276, 1287, 1298, 1320, 1331, 1342, 1353, 1364, 1375, 1386, 1397, 1430, 1441, 1452, 1463, 1474, 1485, 1496
Offset: 1

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Author

Jianing Song, Jan 21 2019

Keywords

Comments

Of course A177894(A239019(n)) = 0 because the corresponding circular matrices each contains at least two identical rows or columns. This sequence gives the other numbers.
A four-digit number abcd is in this sequence if and only if a + c = b + d and (a != c or b != d).

Examples

			2178 is a term because the value of the following determinant is 0, although the determinant itself contains no identical rows or columns:
| 2 1 7 8 |
| 1 7 8 2 |
| 7 8 2 1 |
| 8 2 1 7 |

Links

Crossrefs

Cf. A177894, A239019, A299792.

Programs

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

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