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 A319504 #13 Oct 21 2018 19:27:54
%S A319504 13,17,19,25,29,31,33,37,41,43,49,53,55,57,61,65,67,71,73,79,85,89,91,
%T A319504 97,101,103,109,113,121,127,129,131,133,137,139,141,145,149,151,157,
%U A319504 161,163,169,173,177,181,185,191,193,197,199,201,205,209,211,217,221,223,229,233,235,239,241,244,249,251,253,257,265,269,271,277,281,283,289,293,295,298
%N A319504 Indices of valleys (i.e. local minima) in A064800.
%e A319504 A064800(13) is the first minimum in A064800: A064800(12) = 15, A064800(13) = 14 and A064800(14) = 16 and hence a(1) = 13.
%o A319504 (PARI) lista(nn) = {my(v = vector(nn, n, n + bigomega(n))); for (n=2, nn, if ((v[n] < v[n-1]) && (v[n] < v[n+1]), print1(n, ", ")););} \\ _Michel Marcus_, Sep 21 2018
%Y A319504 Cf. A064800, A317743.
%K A319504 nonn
%O A319504 1,1
%A A319504 _Zak Seidov_, Sep 20 2018
%E A319504 More terms from _Michel Marcus_, Sep 21 2018