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a(n) = phi(n-th untouchable number).
4

%I #9 Sep 23 2022 05:37:20

%S 1,4,24,40,32,32,60,72,54,92,102,48,72,96,80,120,130,132,88,96,112,

%T 144,144,96,132,108,162,96,108,120,168,128,140,168,192,232,156,164,

%U 168,216,192,208,144,176,276,280,192,288,192,192,312,312,276,332,264,232,192

%N a(n) = phi(n-th untouchable number).

%H Amiram Eldar, <a href="/A048188/b048188.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A000010(A005114(n)).

%Y Cf. A000010, A005114, A048189, A048190, A048191.

%K nonn

%O 1,2

%A _Naohiro Nomoto_

%E More terms from _Amiram Eldar_, Sep 23 2022