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I have a list of phone numbers in excel, some of which are obviously duds because they contain repeating digits like this '5555555'. Is there any easy way of identifying these?

Its Excel 2010.

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you could try a VBA solution, such as described here: – Andi Mohr Oct 10 '13 at 15:02
or you can use a CSE formula as described here:… – Andi Mohr Oct 10 '13 at 15:03
You would need to define your own list of "dud numbers": 555,111,999 etc – Andi Mohr Oct 10 '13 at 15:04

This formula will return TRUE if value in A1 repeats any digit 7 times in a row, FALSE otherwise


adjust as required, e.g. replace 7 by required number

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