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a(1) = 7, a(2) = a(1) + 7, a(3) = a(2) + 7 which = a(1) + 7 + 7 which = 7 + 7 + 7.

There are as many multiples of 7 as there are terms, so a(35) = 7 x 35 = 245.

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14y ago

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