378,818,692,300,000,000,000,000,000,000 is. (rounded)
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5.19 times 10 to the 35th power
a(n) = 7n so a(35) = 245
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.
7 to the tenth power divided by 7 to the ninth power = 1
7 to the power of 8