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%I #50 Sep 08 2022 08:46:21
%S 1,16,256,1296,10000,104976,1048576,10556001,100000000,1003875856,
%T 10098039121,100469346961,1000000000000,10016218555281,
%U 100091400875761,1000417426149376,10000000000000000,100004631514837921,1000028258199628641
%N The smallest positive n-digit 4th power.
%F a(n) = ceiling(10^((n-1)/4))^4. - _Charlie Neder_, Jun 13 2019
%F a(n) = A018074(n-1)^4. - _Michel Marcus_, Jun 13 2019
%e a(1) = 1^4 = 1;
%e a(2) = 2^4 = 16;
%e 3^4 = 81 so no increase in number of digits;
%e a(3) = 4^4 = 256.
%o (Magma) sol:=[]; for k in [0..20] do if k mod 4 eq 0 then sol[k+1]:=10^k; else sol[k+1]:=(Floor(10^(k/4)) +1)^4;end if; end for; sol; // _Marius A. Burtea_, Jun 13 2019
%Y Cf. A000583 (4th powers), A018074.
%K nonn,base
%O 1,2
%A _Akshat Kumar Agarwal_, Jun 13 2019
%E a(11)-a(19) from _Charlie Neder_, Jun 13 2019