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A029910 Start with n; if prime, stop; repeatedly sum prime factors (counted with multiplicity) and add 1, until reach 1, 6 or a prime. 1

%I #4 Oct 12 2013 15:29:00

%S 1,2,3,5,5,6,7,7,7,7,11,7,13,7,7,7,17,7,19,7,11,7,23,7,11,7,7,7,29,11,

%T 31,11,7,7,13,11,37,7,17,7,41,13,43,7,7,7,47,7,7,13,11,7,53,7,17,7,23,

%U 11,59,13,61,7,7,13,19,17,67,7,7,7,71,13,73,7,7,7,19,19,79,7

%N Start with n; if prime, stop; repeatedly sum prime factors (counted with multiplicity) and add 1, until reach 1, 6 or a prime.

%e 20 -> 2+2+5+1 = 10 -> 2+5+1 = 8 -> 2+2+2+1 = 7 so a(20)=7.

%K nonn

%O 1,2

%A _Dann Toliver_

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)