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 A367611 #23 Jul 09 2025 05:03:32 %S A367611 1,2,3,4,5,6,7,8,9,10,13,14,15,16,17,18,19,20,21,25,26,27,28,29,30,31, %T A367611 32,37,38,39,40,41,42,43,49,50,51,52,53,54,62,63,64,65,74,75,76,86,87, %U A367611 98 %N A367611 Numbers that are not the comma-child of any positive number. %C A367611 A subsequence of A367600. %C A367611 This 50-term sequence was found by _David W. Wilson_ in 2007. See the _Eric Angelini_ link. %C A367611 See A367338 for definition of comma-child. %H A367611 Eric Angelini, <a href="/A121805/a121805.pdf">The Commas Sequence</a>, Message to Sequence Fans, Sep 06 2016. [Cached copy, with permission] %H A367611 Eric Angelini, Michael S. Branicky, Giovanni Resta, N. J. A. Sloane, and David W. Wilson, The Comma Sequence: A Simple Sequence With Bizarre Properties, <a href="http://arxiv.org/abs/2401.14346">arXiv:2401.14346</a>, Fibonacci Quarterly 62:3 (2024), 215-232. %H A367611 Eric Angelini, Michael S. Branicky, Giovanni Resta, N. J. A. Sloane, and David W. Wilson, <a href="/A121805/a121805_1.pdf">The Comma Sequence: A Simple Sequence With Bizarre Properties</a>, Local copy. %H A367611 N. J. A. Sloane, <a href="https://www.youtube.com/watch?v=_EHAdf6izPI">Eric Angelini's Comma Sequence</a>, Experimental Math Seminar, Rutgers Univ., January 18, 2024, Youtube video; <a href="https://sites.math.rutgers.edu/~zeilberg/expmath/sloane2024.pdf">Slides</a> %o A367611 (Python) %o A367611 def ok(n): y = int(str(n)[0]); x = (n-y)%10; return n - y - 10*x < 1 %o A367611 print([k for k in range(1, 99) if ok(k)]) # _Michael S. Branicky_, Dec 15 2023 %Y A367611 Cf. A121805, A367600. %Y A367611 A367612 gives the complement. %K A367611 nonn,base,fini,full %O A367611 1,2 %A A367611 _Michael S. Branicky_ and _N. J. A. Sloane_, Dec 15 2023