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%I #13 Mar 08 2020 23:54:05
%S 17,59,17,31,13
%N Start with n; repeatedly sum squares of prime factors (counted with multiplicity), until reach a prime p, then set a(n) = p; if reach a fixed point q, set a(n) = q; set a(n) = 0 if no limit exists.
%e 2 -> 2^2 = 4 -> 2^2 + 2^2 = 8 -> 2^2 + 2^2 + 2^12 = 12 -> 2^2 + 2^2 + 3^2 = 17, prime, so stop; a(2)=17.
%Y Cf. A029913.
%K nonn,more
%O 2,1
%A _Dann Toliver_
%E More terms from _Michel ten Voorde_, Apr 12 2001
%E Incorrect extension reverted by _Sean A. Irvine_, Mar 08 2020
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