Hectagonal number

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A hectagonal number is a number arranged to form a hectagon. The formula is n(49n − 48). The first few hectagonal numbers are:

1, 100, 297, 592, 985, 1476, 2065, 2752, 3537, 4420, 5401, 6480, 7657, 8932, 10305, 11776, 13345, 15012, 16777, 18640.

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