There is the "continued digit sum" where the digits of the sum of first order are added again and so on till only one digit remains.
For unsigned intergers written in decimal notation up to 14 digits you get it by
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=MOD(TheNumber;9)+IF(CURRENT()=0;9;0)
(This if you don't accept a result of zero.) "Thanks" automatic conversion the formula also works if the number is given as text.
For any usigned integer number given as a string of decimal digits of up to 65535 places given in cell A1 you get the not continued form by
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=SUMPRODUCT(VALUE(MID(A1;ROW(OFFSET(INDIRECT("a1");0;0;LEN(A1);1));1)))
and since 65535*9 is much less than 10^15 the result is exact and you get the continued digit sum by applying the first given formula only once subsequently:
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=MOD(SUMPRODUCT(VALUE(MID(A1;ROW(OFFSET(INDIRECT("a1");0;0;LEN(A1);1));1)));9)+IF(CURRENT()=0;9;0)
Appendix
-1- As far as I know in "numerology" often are used continued digit sums.
(Very personal now:)
-2- The fundamental approach of n. as I know it (mainly from other requests here) is so absurd for many reasons that I suspect no numerologist would need a next refutation to strengthen his belief. (Paradoxy intended.)
-3- No (next to) believer (in whatever) is interested in arguments - except they comply with his (f/m) position.
-4- I surely am also a believer who just didn't make some relevant beliefs explicit.
-5- Anyway I don't know what my brain will declare next to be my opinion.
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Lupp from München