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The positive integers1,2,3...  are listed in order. What is the 1000th  positive integer with an odd number of digits?

 Dec 18, 2021
 #1
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Problem has already been solved here : 

https://web2.0calc.com/questions/help-plz_43

 Dec 18, 2021
 #2
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If you list all integers IN ORDER from 1 until you encounter the 1000th integer whose digits are all ODD, this is the 1000th number:

 

listfor(n, 1, 13779, n)==(1, 2, 3, 4, 5, 6, 7................13775, 13776, 13777, 13778, 13779) 

 

13,779 is 1000th integer with all its digits ODD, provided the question counts ONLY those numbers with ODD digits: 1, 3, 5, 7, 9, 11, 13....31,....51,.....71,......111,.....1111,......13,771, 13,773, 13,775, 13,777, 13,779 is the 1000th number.

 Dec 18, 2021
 #4
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thanks! 

bruhlmao  Dec 19, 2021
 #3
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100 throu 999 would be 900 of them

   10 000 would be the next one .....10 099 would be the 1000th one

 Dec 18, 2021

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