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Q: What two digit number is equal to three times the product of its digits?

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121

1

There are 15 of them.

21 and 20

A two digit number whose two digits added together equal 42 and multiplied together equal 82

29 2 * 9 = 18 2 + 9 = 11 18 - 11 = 7

412

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

24

1348.

The number is 36

No. Take 12 for example. 1+2=3 but 1x2 doesn't equal 3, it equals 2.

55 52+52 = 50

27

Let the first and third digits be equal. Choose any other number as the second digit. 202, 919, etc.

25 & 36.

The Answer is 36 btw. 3 + 6 = 9 3 x 6 = 2(3x6) 2(18) = 36

It works!

123: 1+2+3=6 1x2x3=6 Also 132, 213, 231,312 and 321

99

Any number which is greater than or equal to 10^12 is 13 digit number.

1,111,111 since 17 = 1

To determine if a number is a palindrome, simply reverse all the digits, then check if the reversed number is equal to the original number. To reverse the digits of a positive number, num: result = 0 while num > 0 { digit = n % 10 (extract the least significant digit) result = result * 10 (move current result digits one place to the left) result = result + digit (append the new digit) num = num / 10 (move digits one place to the right) } end while return result

if the sum of the cubic value of each digit of a number is equal to the original number , then that particular number is an Armstrong number :-) Actually, Armstrong numbers are the sum of their own digits to the power of the number of digits.

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.