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 A246725 #19 Feb 10 2025 12:24:13 %S A246725 2,8,0,7,7,6,4,0,6,4,0,4,4,1,5,1,3,7,4,5,5,3,5,2,4,6,3,9,9,3,5,1,9,2, %T A246725 5,6,2,8,6,7,9,9,8,0,6,3,4,3,4,0,5,1,0,8,5,9,9,6,5,8,3,9,3,2,7,3,7,3, %U A246725 8,5,8,6,5,8,4,4,0,5,3,9,8,3,9,6,9,6,5,9,1,2,7,0,2,6,7,1,0,7,4,1,7,1,1 %N A246725 Decimal expansion of r_3, the third smallest radius for which a compact packing of the plane exists, with disks of radius 1 and r_3. %C A246725 Essentially the same digit sequence as A188934 and A188485. - _R. J. Mathar_, Sep 06 2014 %H A246725 Steven R. Finch, <a href="http://arxiv.org/abs/2001.00578">Errata and Addenda to Mathematical Constants</a>, p. 62. %H A246725 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>. %F A246725 (sqrt(17) - 3)/4. %e A246725 0.2807764064044151374553524639935192562867998063434051... %t A246725 RealDigits[(Sqrt[17] - 3)/4, 10, 103] // First %o A246725 (PARI) (sqrt(17)-3)/4 \\ _Charles R Greathouse IV_, Feb 10 2025 %Y A246725 Cf. A246723 (r_1), A246724 (r_2), A246726 (r_4), A246727 (r_5), A002193 (r_6 = sqrt(2)-1), A246728 (r_7), A246729 (r_8), A246730 (r_9). %K A246725 nonn,cons,easy %O A246725 0,1 %A A246725 _Jean-François Alcover_, Sep 02 2014