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 A222481 #21 Jul 04 2024 15:13:20 %S A222481 0,2,1,5,1,2,2,1,2,1,1,40,4,3,1,3,4,46,3,5,2,12,3,1,4,11,1,3,3,106,2, %T A222481 1,1,2,28,1,7,32,3,42,1,9,1,4,2,2,1,1,15,1,5,1,8,1,1,1,3,1,7,18,13,1, %U A222481 1,1,1,1,5,9,7,3,3,1,1,18,6,5,1,11,1,1,10,2 %N A222481 Continued fraction for cos(1)/(1+cos(1)). %C A222481 Essentially the same as A068115: a(n) = A068115(n) for n != 2. %F A222481 cos(1)/(1+cos(1)) = 1/(1+1/cos(1)) = 1/(1+sec(1)). %e A222481 0.35077679479523758155811675... %p A222481 numtheory[cfrac](evalf(1/(1+1/cos(1)), 250), 130, 'quotients')[]; %Y A222481 Cf. A222480 (decimal expansion), A222482 (Engel expansion), A049470 (cos(1)), A073448 (1/cos(1)), A068115. %K A222481 nonn,cofr %O A222481 0,2 %A A222481 _Alois P. Heinz_, Feb 21 2013 %E A222481 Offset changed by _Andrew Howroyd_, Jul 03 2024