aparler/RosettaCodeData
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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Digital-root/PARI-GP/digital-root.parigp Normal file
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dsum(n)=my(s); while(n, s+=n%10; n\=10); s
additivePersistence(n)=my(s); while(n>9, s++; n=dsum(n)); s
digitalRoot(n)=if(n, (n-1)%9+1, 0)