This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A353146 #13 Apr 27 2022 19:46:51 %S A353146 0,1,14,216,3145,44252,641640,12305251,163304624,2516300046, %T A353146 36351200665,542225612642,11012302601310,143163240420331, %U A353146 2224515456064634,32255340625240206,453016062064453015,6552245200234552232,125142553603416142350 %N A353146 Decimal repunits written in base 7. %F A353146 a(n) = A007093(A002275(n)). %o A353146 (PARI) a(n) = fromdigits(digits((10^n-1)/9, 7)); %Y A353146 Cf. A002275, A291962, A353142, A353143, A353144, A353145, A353147, A353148. %Y A353146 Cf. A007093, A023000. %K A353146 nonn,base,easy %O A353146 0,3 %A A353146 _Seiichi Manyama_, Apr 26 2022