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.

A268854 a(n) is the smallest magic sum of any 3 X 3 magic square which contains exactly n triangular numbers.

Original entry on oeis.org

39, 24, 21, 15, 18, 24, 189, 67734
Offset: 0

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Author

Arkadiusz Wesolowski, Feb 14 2016

Keywords

Links

Crossrefs

Cf. A221669, A268855, A268856, A269231, A271020.

A271022 Magic sums of 3 X 3 semimagic squares of odd squares whose rows, columns, and at least one of the two main diagonals sum to the same number.

Original entry on oeis.org

394310739, 500961771, 929224371, 1025775531, 1059837819, 3548796651, 4508655939, 6001029211, 8363019339, 9231979779, 9538540371, 9857768475, 12524044275, 15048773931, 17542500091, 19321226211, 23230609275, 24547126779, 25644388275, 26495945475, 29179154203, 31939169859
Offset: 1

Views

Author

Arkadiusz Wesolowski, Mar 28 2016

Keywords

Links

Crossrefs

Cf. A271020, A271021, A269297, A271142. Subsequence of A271021.

Formula

a(n) = 8*A271020(n) + 3.
A269297 INTERSECT A271021.

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.
Showing 1-3 of 3 results.

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

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