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%I #13 Apr 27 2022 19:48:14
%S 0,1,23,1233,101113,2231213,123020013,10033101013,222120223013,
%T 12213312233013,1002032203113013,22112101201213013,
%U 1213132233100013013,100022303120201013013,2201230001311023013013,121100320102103233013013,3330220302313011113013013
%N Decimal repunits written in base 4.
%F a(n) = A007090(A002275(n)).
%o (PARI) a(n) = fromdigits(digits((10^n-1)/9, 4));
%Y Cf. A002275, A291962, A353142, A353144, A353145, A353146, A353147, A353148.
%Y Cf. A002450, A007090.
%K nonn,base,easy
%O 0,3
%A _Seiichi Manyama_, Apr 26 2022
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