A265197 - OEIS

%I #20 Jan 15 2025 16:42:21

%S 711,1251,1527,1712,2132,2486,2616,2812,2934,3357,3441,3781,3812,4156,

%T 4288,4842,4971,4972,5034,5346,5382,5659,5842,5886,6147,6159,6402,

%U 6734,6747,7062,7312,7403,7592,7722,8034,8102,8342,8831,8862,8961,9092,9117

%N Magic sums of 3 X 3 semimagic squares composed of triangular numbers.

%C These semimagic squares are composed of 9 distinct triangular numbers >= 0.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Triangular_number">Triangular number</a>

%H <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a>

%e A semimagic square with sum 1527:

%e   |----|----|----|

%e   | 0  |351 |1176|

%e   |----|----|----|

%e   |666 |741 |120 |

%e   |----|----|----|

%e   |861 |435 |231 |

%e   |----|----|----|

%Y Cf. A000217, A265141, A265198, A269060 (for positive triangular numbers).

%K nonn

%O 1,1

%A _Arkadiusz Wesolowski_, Dec 04 2015