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 A292772 #13 Jan 05 2025 19:51:41
%S A292772 1,2,3,4,6,8,12,18,25,38,56,89,138,218,342,547,882,1429,2299,3705,
%T A292772 5961,9615,15524,25057,40442,65247,105412,170224,274963,44156,717551,
%U A292772 1159406,1873356
%N A292772 a(n) = cardinality of a certain set of natural numbers defined using A117818.
%C A292772 Let s(n) = A117818(n). Define sets C_n of natural numbers by C_0 = {1}; C_(n+1) = C_n union {s(x+y): x, y in C_n} for n >= 0. Then a(n) = |C_n|.
%H A292772 Mihai Caragiu, P. A. Vicol, and M. Kaki, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Papers1/55-4/CaragiuVicolZaki03162017.pdf">On Conway's subprime function, a covering of N and an unexpected appearance of the golden ratio</a>, Fib. Q., 55 (2017), no. 4, 327-331.
%Y A292772 Cf. A117818.
%K A292772 nonn,more
%O A292772 0,2
%A A292772 _N. J. A. Sloane_, Sep 29 2017