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a(1) = 1; a(n) = smallest nontrivial n-th power with property that digits alternate in parity individually as well as in concatenation with previous terms.
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%I #6 Mar 23 2024 03:28:16

%S 1,4,125,81

%N a(1) = 1; a(n) = smallest nontrivial n-th power with property that digits alternate in parity individually as well as in concatenation with previous terms.

%C Conjecture: the sequence is finite.

%C Certainly finite because a(10) does not exist (see A068890). - _Sean A. Irvine_, Mar 22 2024

%Y Cf. A068890.

%K base,fini,nonn

%O 1,2

%A _Amarnath Murthy_, Mar 20 2002