I know of no simple equation or formula for determing this. You can try the brute force method of counting them. 505, 515, 525, 535, 545, 555, 565, 575, 585, 595
500
40 palindromes.
505,515,...595 -- 10 p. numbers 606,616,...696 -- 10 p. numbers notice the pattern --- looks like there are 50
A palindromic number reads the same forwards and backwards. For the range between 500 and 700, the relevant palindromic numbers are 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 606, 616, 626, 636, 646, 656, 666, 676, 686, 696. Each of these numbers can form a pair with its reverse, but since we're limited to the range of 500 to 700, we only consider pairs where both numbers are different and fall within the specified limits. The only palindrome that creates a valid pair is 606, which is not different from itself. Thus, there are no pairs of different palindromic numbers between 500 and 700.
40. There are 400 numbers between 100 and 500 and one in every ten ends in 5.
500
40 palindromes.
There are 9 palindromic numbers between 400 and 500. A palindromic number reads the same forwards and backwards. The palindromic numbers in this range are 404, 414, 424, 434, 444, 454, 464, 474, and 484.
505,515,...595 -- 10 p. numbers 606,616,...696 -- 10 p. numbers notice the pattern --- looks like there are 50
A palindromic number reads the same forwards and backwards. For the range between 500 and 700, the relevant palindromic numbers are 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 606, 616, 626, 636, 646, 656, 666, 676, 686, 696. Each of these numbers can form a pair with its reverse, but since we're limited to the range of 500 to 700, we only consider pairs where both numbers are different and fall within the specified limits. The only palindrome that creates a valid pair is 606, which is not different from itself. Thus, there are no pairs of different palindromic numbers between 500 and 700.
There are 232 numbers between 1 and 500 that are divisible by 3 or 5.
There are 43 natural numbers between 200 and 500 that are divisible by seven.
There are 95 Prime #'s between 1 and 500
400 of them.
727. The smallest palindromic number greater than 500 independent of primicity is 505.
1 to 500 bisham
40. There are 400 numbers between 100 and 500 and one in every ten ends in 5.