13541
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E78 = 3704Divide 3704 by decreasing powers of 7 as follows:3704 = 1*7^4 + 3*7^3 + 5*7^2 + 4*7^1 + 1*7^0Then the base7 value is the string formed by the coefficients of the powers of 7, that is, 13541.
1.000.000 (a million) is the smallest 7-digit number in radix 10 (decimal number). Here are some result of converted value form other bases : * Radix 2 : 26 = 128 * Radix 8 : 86 = 262.144 * Radix 16 : 166 = 16.777.216
The radix is a property of a numerical system, not an individual number. It is the number of different digits (or characters) used by the system to represent all numbers. Thus the radix of the binary system is 2: 0 and 1 the radix of the octal system is 8: 0,1,2,3,4,5,6 and 7 the radix of the decimal system is 10: 0,1,2,3,4,5,6,7,8 and 9 and so on. Since a number cannot have a radix, the question does not make sense.
5 (penta = 5, hexa = 6, hepta = 7, octo = 8...)
I presume by hexa you mean hexadecimal, which is base 16. A hexadecimal number can be considered a polynomial in a variable whose value is 16, the coefficients being whole numbers ranging from 0 to 15. The hexadecimal digits after 9 are usually written as the letters A through F (sometimes in lower case); A means 10, B means 11, and so on. Just plug in 16 for the variable and evaluate the polynomial. For example, consider the hexadecimal number 3E7. The 7 is in the units place, the E, meaning 14, is in the 16's place, and the 3 is in the 162 (256) place. So the value of this number, in decimal, is 3 x 256 + 14 x 16 + 7, which works out to be 999 (so help me, I picked those digits at random!).