A sad number is any number which is not a happy number. Sad numbers between 1 and 99 are as follows:
2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 27, 29, 30, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 83, 84, 85, 87, 88, 89, 90, 92, 93, 95, 96, 98, 99.
100
Not including 1 and 100, 99
90. all the numbers from 10 through 99
The sum of the integers 1 to 99 is 4950. An easy way to figure this out is using the equation N*(N+1)/2 where N is the largest number in the set.
100
There are 49 even numbers between 1 and 99.
99
25
There are 50 odd numbers between 0 and 99. These numbers are 1, 3, 5, 7, and so on, up to 99. The sequence of odd numbers can be represented as 2n + 1, where n ranges from 0 to 49. Thus, the total count of odd numbers is 50.
100
Not including 1 and 100, 99
The greatest common factor of 99 and 25 is 1. There are not other numbers that are common between them.
Three-digit numbers range from 100 to 999. To find the count of three-digit numbers between 99 and 3000, we consider the range from 100 to 999, which includes 900 numbers (999 - 100 + 1 = 900). Thus, there are 900 three-digit numbers between 99 and 3000.
90. all the numbers from 10 through 99
The three-digit numbers between 99 and 400 start from 100 and go up to 399. To find the total count, we can calculate it as follows: 399 - 100 + 1 = 300. Therefore, there are 300 three-digit numbers between 99 and 400.
9 of them.
1. The numbers 1 through 99 are 99 different numbers; each one occurs once.