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 A386905 #12 Aug 07 2025 15:03:01
%S A386905 1,2,3,7,23,11415,
%T A386905 56553873808298479843537432588765043239809588104012779518849306976361095532563320075112688420502361617080665176812695
%N A386905 Distinct terms in A385988.
%H A386905 David A. Corneth, <a href="/A386905/a386905.gp.txt">PARI program</a>
%t A386905 s = 0; k = 1; Reap[Do[s += k; If[IntegerQ@ Log2[s], k = n; Sow[k]], {n, 2^16}] ][[-1, 1]] (* _Michael De Vlieger_, Aug 07 2025 *)
%o A386905 (PARI) \\ See Corneth link
%Y A386905 Cf. A385988.
%K A386905 nonn
%O A386905 1,2
%A A386905 _Paolo Xausa_ and _David A. Corneth_, Aug 07 2025