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 A304530 #6 May 16 2018 20:07:33 %S A304530 1,4,8,11,14,18,25,28,32,35,39,42,45,49,52,55,59,66,69,73,76,80,91,94, %T A304530 115,118,122,125,128,132,139,142,146,149,152,156,160,163,167,170,173, %U A304530 177,196,199,203,206,209,213,220,223,227,230,234,237,240,244,247,250,254,261,264,268,271,275,278,281,285,288,291,295,309,312,316,319,322,326,338 %N A304530 Positions of odd terms in A304531. %C A304530 After A304531(2) = 2, the positions of other primes in A304531 are: 4, 11, 42, 237, 1798, 7192, 69611, 431203, 2401568, ... %H A304530 Antti Karttunen, <a href="/A304530/b304530.txt">Table of n, a(n) for n = 1..50000</a> %o A304530 (PARI) for(n=1,oo,if(A304531(n)%2, print1(n,", "))) %Y A304530 Cf. A304531. %Y A304530 Differs from A303750 for the first time at n=18, where a(18) = 66, while A303750(18) = 71. %K A304530 nonn %O A304530 1,2 %A A304530 _Antti Karttunen_, May 14 2018