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a(1) = 15 because 15^3 + 744 ~ exp(Pi*sqrt(7)).
a(2) = 32 because 32^3 + 744 ~ exp(Pi*sqrt(11)).
a(3) = 96 because 96^3 + 744 ~ exp(Pi*sqrt(19)).
a(4) = 960 because 960^3 + 744 ~ exp(Pi*sqrt(43)).
a(5) = 5280 because 5280^3 + 744 ~ exp(Pi*sqrt(67)).
a(6) = 640320 because 640320^3 + 744 ~ exp(Pi*sqrt(163)).
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