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 A055986 #9 Aug 27 2025 06:02:44 %S A055986 10,15,20,30,45,65,95,140,285,575,1235,3875,12035,57425,277685, %T A055986 1898225,17948735,257659250,6064652775,231735692810,19086421036065, %U A055986 3118766577500345,1345923015886969490,1802200377671427935160,7651243417360291340175315 %N A055986 a(n+1) = a(n) converted to base 10 from base 15. %t A055986 NestList[FromDigits[IntegerDigits[#],15]&,10,30] (* _Harvey P. Dale_, Sep 16 2011 *) %Y A055986 Cf. A055985, A055987. %K A055986 base,nonn,changed %O A055986 0,1 %A A055986 _Henry Bottomley_, Jun 01 2000 %E A055986 More terms from _Harvey P. Dale_, Sep 16 2011