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 A140577 #23 Feb 16 2025 08:33:08
%S A140577 3,0,0,8,4,9
%N A140577 Decimal expansion of Wroblewski's constant arising in nonaveraging sequences.
%C A140577 A nonaveraging sequence contains no three terms which are in an arithmetic progression. Wroblewski (1984) showed that for infinite nonaveraging sequences Sup_{all nonaveraging sequences b(n)} Sum_{k>=1} 1/b(k) > 3.00849. [Typo corrected by _Stefan Steinerberger_, Aug 28 2008]
%D A140577 Steven R. Finch, "Erdos' Reciprocal Sum Constants." 2.20 in Mathematical Constants. Cambridge, England: Cambridge University Press, pp. 163-166, 2003.
%D A140577 R. K. Guy, "Nonaveraging Sets. Nondividing Sets." C16 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 131-132, 1994.
%H A140577 Eric W. Weisstein, <a href="https://mathworld.wolfram.com/NonaveragingSequence.html">Nonaveraging Sequence</a>.
%H A140577 J. Wroblewski, <a href="http://dx.doi.org/10.1090/S0025-5718-1984-0744935-8">A Nonaveraging Set of Integers with a Large Sum of Reciprocals</a>, Math. Comput. 43, 261-262, 1984.
%H A140577 <a href="http://oeis.org/wiki/Index_to_OEIS:_Section_No#non_averaging">Index entries related to non-averaging sequences</a>
%Y A140577 Cf. A051013, A131741, A133234.
%K A140577 cons,more,nonn
%O A140577 1,1
%A A140577 _Jonathan Vos Post_, Jul 05 2008