7344, 14688, 22032, 29376, 36720, 44064, 51408, 58752, 66096, . . .
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It is 917969.
They are all the multiples of 16.They are all the multiples of 16.They are all the multiples of 16.They are all the multiples of 16.
Not all multiples of 40 are multiples of 80. Only the even multiples of 40 are also multiples of 80. The odd multiples, e.g. 40, 120, 200, 280, and 360, are not multiples of 80.
Multiples of the multiples of 10
You are multiplying by 5 and taking 1 away, so the next value is 36719.