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Mich modulus 11
 
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Default Vezerid Modulus 11

thank you, I shall give it a go

"vezerid" wrote:

Michelle,
I just realized there was a detail in the algorithm I overlooked. The
following formula is, I believe, correct (at least it produces 2 for
the specific number; if you have other numbers that you can check
manually, or you already know the answer, you can check these as well).

=11-MOD(SUMPRODUCT(VALUE(MID(A1,ROW(INDIRECT("1:"&LEN( A1))),1)),MOD(LEN(A1)+1-ROW(INDIRECT("1:"&LEN(A1)))-1,6)+2),11)

Again it has to be array entered.

HTH
Kostis Vezerides