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Magic sums of 3 X 3 semimagic squares composed of positive triangular numbers and squares.
3

%I #14 Jan 15 2025 16:41:49

%S 136,146,161,175,200,230,236,250,263,277,280,290,301,316,317,326,340,

%T 346,355,370,382,394,395,398,406,410,416,421,425,431,434,436,445,446,

%U 450,461,470,472,481,484,487,494,497,499,502,511,515,518,520,527,530

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

%H Andrew Howroyd, <a href="/A269062/b269062.txt">Table of n, a(n) for n = 1..3093</a>

%e A semimagic square with sum 136:

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

%e | 6 | 25 |105 |

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

%e | 49 | 66 | 21 |

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

%e | 81 | 45 | 10 |

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

%Y Cf. A269060, A269061.

%K nonn

%O 1,1

%A _Arkadiusz Wesolowski_, Feb 18 2016