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 A348196 #13 Oct 07 2021 07:22:50 %S A348196 0,0,1,2,3,4,6,8,9,11,14,15,17,20,21,24,28,31,34,37,41,44,46,49,54,58, %T A348196 61,66,70,74,78,83,87,93,98,103,107,112,116,119,126,133,136,143,148, %U A348196 154,159,167,175,180,184,192,201,207,212,219,226,232,240,247,255,262,268,276,283,292,300,307,314,322,331,336,346,354 %N A348196 Number of primes of the form 4k+1 < n^2. %H A348196 Seiichi Manyama, <a href="/A348196/b348196.txt">Table of n, a(n) for n = 1..10000</a> %F A348196 a(n) = A066339(n^2). %o A348196 (PARI) a(n) = sum(k=2, n^2-1, isprime(k)&&k%4==1); %Y A348196 Cf. A066339, A348193, A348195. %K A348196 nonn %O A348196 1,4 %A A348196 _Seiichi Manyama_, Oct 06 2021