Q: Find a number of two digit is equal two three times the sum of digits?

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1348.

smallest 8 digit number with three different digits

Yes. But that is true only if the 100 digits do not include 0. Or, if 0 is included, then you consider "0n0" to be a three digit number. Most people would consider is to be a 2-digit number.

The largest three digit prime number whose digits are all primes is 773.

The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987

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Only if the final digit, after the decimal point, is zero.

1348.

102 is the smallest three digit number with different digits.

smallest 8 digit number with three different digits

Yes. But that is true only if the 100 digits do not include 0. Or, if 0 is included, then you consider "0n0" to be a three digit number. Most people would consider is to be a 2-digit number.

21

The largest three digit prime number whose digits are all primes is 773.

The largest number with no repeated digits is 9,876,543,210 although it is 10 digits long, the largest 3 digit number with no repeated digits is 987

N squared would be used to find the square root of a number or numbers. In order to find the number of three digit numbers such that the sum of the square results of any two digits are equal to the third digit the use of the formula (HOE)squared=Hsquared*10000+2HE*100+Esquared is needed.

All five digit numbers have three digits. The smallest five digit whole number is 10,000

21.

Three of them.