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 A139349 #25 Feb 07 2022 02:59:45 %S A139349 2,1,1,7,7,4,2,4,0,0,6,3,6,6,1,4,4,4,0,8,7,2,8,0,4,0,4,0,9,3,7,1,3,0, %T A139349 2,1,3,3,0,7,1,8,5,3,5,5,3,6,4,1,7,4,0,6,1,7,5,4,3,5,6,5,6,6,7,8,9,4, %U A139349 6,1,6,1,8,5,2,9,6,3,3,7,1,6,9,2,4,2,6,8,3,7,9,4,9,2,4,6,5,3,3,1,8,7,3,3,6 %N A139349 Decimal expansion of negated secant of the golden ratio. That is, the decimal expansion of -sec((1+sqrt(5))/2). %C A139349 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019 %H A139349 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>. %F A139349 Equals sec(A001622). %F A139349 Equals 1/A139346. - _Amiram Eldar_, Feb 07 2022 %e A139349 21.17742400636614440872804040937130213307185355364174... %t A139349 RealDigits[-Sec[GoldenRatio],10,120][[1]] (* _Harvey P. Dale_, Dec 08 2011 *) %o A139349 (PARI) -1/cos((sqrt(5)+1)/2) \\ _Charles R Greathouse IV_, May 13 2019 %Y A139349 Cf. A001622, A094214, A104457, A098317, A002390, A139339, A139340, A139341, A139342, A139345, A139346, A139347, A139348. %K A139349 nonn,cons %O A139349 2,1 %A A139349 _Mohammad K. Azarian_, Apr 15 2008 %E A139349 Offset corrected by _Mohammad K. Azarian_, Dec 13 2008 %E A139349 Sign in definition added by _R. J. Mathar_, Feb 05 2009