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Cototients of non-cototient numbers: A051953(A005278(n)).
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%I #15 Mar 14 2018 06:47:48

%S 6,14,18,30,28,30,44,60,60,62,82,68,74,94,106,88,126,102,104,110,150,

%T 120,124,164,158,136,138,178,148,150,190,164,212,176,174,182,246,252,

%U 194,198,204,208,220,234,286,318,242,322,302,328

%N Cototients of non-cototient numbers: A051953(A005278(n)).

%C The iteration-graph (rooted tree) of A051953 has initial vertices given by A005278. Sequence gives immediate successors of initial terms. The iteration ends at 0 fixed point.

%H Michel Marcus, <a href="/A053474/b053474.txt">Table of n, a(n) for n = 1..10000</a>

%e 30, 60, 150 and 164 occur twice in the terms shown. These numbers occur in A051953, but their arguments do not: 50, 58 or 100, 116 or 222, 298 or 260, 326 are non-cototients, terms of A005278.

%Y Cf. A005278, A051953.

%K nonn

%O 1,1

%A _Labos Elemer_, Jan 14 2000