1,1
E.g. 599 -> 5 + 9 + 9 = prime 23.
Sequence in context: A091924 A069108 A156604 this_sequence A090712 A082257 A054750
Adjacent sequences: A046861 A046862 A046863 this_sequence A046865 A046866 A046867
nonn,base,easy
Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1999.
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