Question

find the 500th polyndrom number

Answer 1

5005

Answer 2

can you explain ?

Answer 3

what do you mean by 500th

Answer 4

the fifth hundred polyndrom number

Answer 5

Palindromic number, right?

Answer 6

yes

Answer 7

Is there a formula? Maybe u need a program to list them...

Answer 8

i don't know , that's why i'm asking you

Answer 9

I think you mean palindrome. There is no such word as polyndrom in math or the English language for that matter.

Answer 10

Curious.... can a single digit be palindromic?

Answer 11

yes

Answer 12

basically palindorme is a number from any side(left or right) you read it the number remains the same like 5005 , 224422, etc

Answer 13

right

Answer 14

"Take any positive integer of two digits or more, reverse the digits, and add to the original number. This is the operation of the reverse-then-add sequence. Now repeat the procedure with the sum so obtained until a palindromic number is obtained."

Answer 15

there are infinite palindrome numbers so i m confused fifth hundred palindrome number

Answer 16

Write a program in your desired language based on above.

Answer 17

i got 40104 , is it correct ?

Answer 18

yes

Answer 19

can you explain it ? i'm not sure

Answer 20

you read your number from left to right frist it is 4 0 1 0 4
now read it from right to left it is still 4 0 1 0 4

Answer 21

honestly , i got it from my book , in the answer key , but without any explanation

Answer 22

but this is explaination

Answer 23

but how can you get the answer? would explain it please?

Answer 24

i just know whether a number is palindrome or not but in your question 500th is mentioned where i m still confuse

Answer 25

Interesting.... according to wolfram, since you want the 500th palindromic number, and 500 is between 198 and 1098, it must be less than 10^5..:
http://www.wolframalpha.com/input/?i=500th+palindromic+number

idk how to get that number though... :(
must be a pattern somewhere.

Answer 26

i think the answered is 40104

Answer 27

Can you explain how you get it?

Answer 28

It should be 828.

Answer 29

my book said the answer is 40104, i'm confused

Answer 30

OK! Well I guess books are never wrong?? Right?

Answer 31

okay, can you explain it to me? @calculusfunctions

Answer 32

read this may be it help you

All the digits are palindromes (1,2,3,...,9).

There are also 9 palindromes with two digits (11,22,33, ...,99).

You can find to every two-digit number one, and only one number with three digits and with four digits.
For example: For the number 34 there are 343 and 3443.
You can conclude that there are 90 palindromes with three and also 90 palindromes with four digits.

You can find to every three-digit number one, and only one number with five digits and with six digits.
For example: To the number 562 there are 56265 and 562265.
You can conclude that there are 900 palindromes with five and 900 palindromes with six digits.

You have 9+9+90+90+900+900 = 1998 palindromes up to one million. About every 500th number is a palindrome.

Answer 33

okay, thank you, it helps me so much

Answer 34

welcome

Answer 35

i'm sorry, but i give oup :(

Answer 36

i am sorry

Answer 37

okaay

Answer 38

Ummm... I respectfully disagree with the statement that every 500th number is a palindrome. Also I apologize because I made an error in my own answer. It is not 828.

Answer 39

[int("%d%d%d" % (x,y,x)) for x in range(1,10) for y in range(10)] in Python.

generates all 3 digit palindromes

You can play around and develop one that generates a bigger list and the number of each palindrome in order to find the 500th one.

Or perhaps for your case, just brute force it, programatically test every number until you reach the 500th...