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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 15, 2021
 #1
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The answer is 6.

 May 15, 2021
 #2
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Thanks for the help but its wrong

Guest May 15, 2021
 #3
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(1234, 1357, 2345, 2468, 3456, 3579, 4567, 5678, 6789)==9 such numbers

 May 15, 2021

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