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 A021687 #16 Nov 01 2024 11:28:31 %S A021687 0,0,1,4,6,4,1,2,8,8,4,3,3,3,8,2,1,3,7,6,2,8,1,1,1,2,7,3,7,9,2,0,9,3, %T A021687 7,0,4,2,4,5,9,7,3,6,4,5,6,8,0,8,1,9,9,1,2,1,5,2,2,6,9,3,9,9,7,0,7,1, %U A021687 7,4,2,3,1,3,3,2,3,5,7,2,4,7,4,3,7,7,7,4,5,2,4,1,5,8,1,2,5,9,1 %N A021687 Decimal expansion of 1/683. %C A021687 Radiant intensity in any given direction, expressed in W/sr (Watts per steradian), of a luminous source with the frequency 540*10^12 Hz, corresponding to 1 cd (candela). Defined and fixed in 1979 by the 16th CPGM. - _Stanislav Sykora_, Mar 30 2015 %H A021687 Bureau International des Poids et Mesures, <a href="http://www.bipm.org/en/worldwide-metrology/cgpm/">General Conference on Weights and Measures</a> %H A021687 Wikipedia, <a href="http://en.wikipedia.org/wiki/Candela">Candela</a> %H A021687 Wikipedia, <a href="http://en.wikipedia.org/wiki/Radiant_intensity">Radiant intensity</a> %e A021687 0.0014641288433382137628111273792... %t A021687 d = RealDigits@ N[1/683, 120]; PadLeft[First@ d, Length@ First@ d + Abs@ Last@ d] (* _Michael De Vlieger_, Mar 30 2015 *) %t A021687 realDigitsRecip[683] (* The realDigitsRecip program is at A021200 *) (* _Harvey P. Dale_, Nov 01 2024 *) %o A021687 (PARI) 1/683.0 \\ _Michel Marcus_, Mar 31 2015 %K A021687 nonn,cons %O A021687 0,4 %A A021687 _N. J. A. Sloane_