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%I #23 Jul 01 2021 15:45:53
%S 3,11,19
%N Primes whose trajectory under the map x -> A039951(x) enters the cycle {3, 11, 71}.
%C From _Felix Fröhlich_, Jul 01 2021: (Start)
%C Further terms in the sequence are 71, 107, 127, 139, 167, 179, etc. The smallest prime where it is unknown whether it is in this sequence (or in A252801 or A252812) is 47.
%C Is A000040 the union of this sequence, A252801 and A252812? (End)
%e The trajectory of 19 under the given map starts 19, 3, 11, 71, 3, ..., entering the given cycle, so 19 is a term of the sequence.
%Y Cf. A000040, A039951, A244550, A252801, A252812.
%K nonn,hard,more,bref
%O 1,1
%A _Felix Fröhlich_, Dec 22 2014
%E Name edited by _Felix Fröhlich_, Jun 19 2021