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 A195420 #15 Mar 15 2023 10:50:17 %S A195420 125,126,127,2500,2501,2502,2503,2504,2505,2506,2507,2508,6144,11663, %T A195420 11664,12100,12101,12102,12103,12104,12105,12106,12107,12108,12768, %U A195420 13822,13823,13824,13825,15378,15567,15585,15612,15617,15620,15621,15622,15623,15624 %N A195420 Friedman numbers n such that n+1 is also a Friedman number. %Y A195420 Cf. A036057. %K A195420 nonn,base,less %O A195420 1,1 %A A195420 _Kausthub Gudipati_, Sep 18 2011 %E A195420 Extended by _T. D. Noe_, Sep 20 2011