Centered triangular number

centered figurate number that represents a triangle with a dot in the center and all other dots surrounding the center in successive triangular layers

274 361 1135 1489 1786 1891 1585 1306 1396 694 976 1684 2110 1 4 10 631 19 85 64 1219 1054 109 199 760 31 46 136 166 409 829 1999 514 571 235 460 316 901

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