7 in any base above 7, converted to base 7, would be written 10
In base 10, the places from right to left are 10^0 (ones place), 10^1 (tens place), 10^2 (hundreds place) and so on, and there are ten digits, from zero to nine (one less than ten). In base seven, the places from right to left are 7^0 (ones place), 7^1 (sevens place), 7^2 (forty-nines place), and so on, and there are seven digits, from zero to six. If you have a seven and wanted to write it in base 7, it would convert to a one in the sevens place and a zero in the ones place; 10.
In base 10, the places from right to left are 10^0 (ones place), 10^1 (tens place), 10^2 (hundreds place) and so on, and there are ten digits, from zero to nine (one less than ten). In base seven, the places from right to left are 7^0 (ones place), 7^1 (sevens place), 7^2 (forty-nines place), and so on, and there are seven digits, from zero to six. If you have a seven and wanted to write it in base 7, it would convert to a one in the sevens place and a zero in the ones place; 10.
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7 base 10 expressed in base 7 = 1(7^1) + 0(7^0) = 10 (base 7)
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(7^1)*1 + (7^0)*0
In base 7, 7 is 10.
In base 7, 7 is 10.