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 A285220 #8 Nov 19 2017 17:21:12 %S A285220 2,30,49,54,56,85,91,104,135,175,195,203,266,303,343,409,421,427,445, %T A285220 448,523,538,607,622,780,1006,1109,1186,1338,1341,1453,1591,1629,1707, %U A285220 1826,1852,1884,1949,2033,2039,2056,2154,2408,2444,2495,2559,3134,3227,3240 %N A285220 Indices of primes in A006128. %H A285220 Vaclav Kotesovec, <a href="/A285220/b285220.txt">Table of n, a(n) for n = 1..257</a> %e A285220 30 is in the sequence because A006128(30) = 54563 is prime. %Y A285220 Cf. A006128, A046063. %K A285220 nonn %O A285220 1,1 %A A285220 _Vaclav Kotesovec_, Apr 14 2017