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In how many positive four-digit integers that are not multiples of 1111 do the digits form an arithmetic sequence from left to right?

 May 27, 2019
 #1
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1234      9876     5432

1357      9753     4321

2345      9630     3210 

2468      8765    

3456      8642     

3579      7654      

4567      7531      

5678      6543    

6789      6420     

 

I count 21......anyone have a different result  ????

 

cool cool cool

 May 27, 2019

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