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 A362909 #60 Dec 19 2024 11:45:36 %S A362909 1,3,6,10,22,31,34,37,40,121,1035,1078,1121,7607,9453,13667,13729, %T A362909 50040,50123,50206,615964,616448,616932,617416,2828280,2851232, %U A362909 2874184,2897136,5350614,5583250,5594326,17310256,17312210,17994974,18008820,19051432,19069162 %N A362909 a(n) is the smallest number k such that A362881(k) = n. %C A362909 All positive integers will appear in A362881. _Rémy Sigrist_ showed that as a consequence of Van der Waerden's theorem, A362881 is unbounded. %C A362909 The present sequence is monotonically increasing since a progression of length n begins with a progression of length n-1 so a(n-1) < a(n). %H A362909 Kevin Ryde, <a href="/A362909/b362909.txt">Table of n, a(n) for n = 1..62</a> %H A362909 Samuel Harkness, <a href="/A362909/a362909.m.txt">MATLAB program for A362909</a> %H A362909 Kevin Ryde, <a href="/A362909/a362909.c.txt">C Code</a> %o A362909 (MATLAB) See Links section. %o A362909 (C) /* See links */ %Y A362909 Cf. A362881. %K A362909 nonn %O A362909 1,2 %A A362909 _Samuel Harkness_, May 14 2023 %E A362909 a(25)-a(31) from _Yang Haoran_, May 17 2023 %E A362909 a(32)-a(37) from _Kevin Ryde_, May 22 2023