There are thirty-nine palindromic numbers between 10 and 400. They are 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 303, 313, 323, 333, 343, 353, 363, 373, 383, and 393.
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If you write all of the counting numbers from 200 to 400,you will write the digit ' 5 ' forty times.
There are 151 even numbers between 100 and 400. To find this, you can use the formula for calculating the number of integers in a range: (largest number - smallest number) / 2 + 1. In this case, it would be (400 - 100) / 2 + 1 = 151.
To find the numbers between 400 and 600 that either begin or end with the digit 5, we can break it down into two parts. First, let's find the numbers that begin with 5: There are 10 numbers between 500 and 599 that start with 5. Next, let's find the numbers that end with 5: There are 10 numbers between 405 and 595 that end with 5. Adding these two sets together gives us a total of 20 numbers between 400 and 600 that either begin or end with the digit 5.
The 17 prime numbers between 400 and 500 are 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, and 499.
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