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 A267693 #92 Apr 01 2022 09:14:25 %S A267693 1,1,2,5,7,9,6,5,5,4,1,6,5,6,8,3,2,6,6,4,6,2,1,1,9,4,2,4,1,2,0,8,4,0, %T A267693 2,1,7,1,3,4,7,6,5,1,6,4,0,3,1,1,5,4,1,1,8,4,8,0,0,5,6,6,4,3,8,5,1,7, %U A267693 8,1,9,2,1,1,7,0,6,3,9,6,0,3,4,9,3,0,3,7,5,2,6,5,5,1,8,0,5,5,2,2,7,7,5,5 %N A267693 Decimal expansion of 477/4237. %C A267693 In the Antikythera mechanism this constant represents the difference between the time it takes for the moon to return to perigee and the time it takes for the moon to come back to the same point in the zodiac, in a year's turn. %C A267693 The discovery that the constant 0.112579655 is present in the Antikythera mechanism is due to Tony Freeth. %C A267693 The prime numbers 19, 53, 127 and 223 are related to the number of teeth of some of the known 30 bronze gearwheels of the mechanism (see A240136). %C A267693 The prime numbers 19, 53 and 223 appear in the formula of this constant. They are also the first three primes congruent to 19 mod 34 (see A142072), or in other words: the first three odd primes of the form 17*n+2 (see A140544). %C A267693 The function of one or two gears with 63 teeth is unknown. %C A267693 Note that in ancient astronomy a cycle of 126 days was known to be related to Mercury and also a cycle of 13*19 + 5 = 252 days related to Venus; both 126 and 252 are multiples of 63. %H A267693 Tony Freeth, <a href="https://www.jstor.org/stable/26001660">Decoding an ancient computer</a>, Scientific American (dec 2009), p. 82. %H A267693 Tony Freeth and Alexander Jones, <a href="http://dlib.nyu.edu/awdl/isaw/isaw-papers/4/">The cosmos in the Antikythera mechanism</a>, (2012). %H A267693 Wikipedia, <a href="http://wikipedia.org/wiki/Antikythera_mechanism">Antikythera mechanism</a> %F A267693 d = (18/223)*(53/38) = (9/223)*(53/19) = 477/4237. %e A267693 0.11257965541656832664621194241208402171347651640311541... %t A267693 First@ RealDigits@ N[477/4237, 120] (* _Michael De Vlieger_, Jan 27 2016 *) %o A267693 (PARI) 477/4237. \\ _Charles R Greathouse IV_, Apr 18 2016 %Y A267693 Cf. A000040, A140544, A142072, A240136. %K A267693 nonn,cons,easy %O A267693 0,3 %A A267693 _Omar E. Pol_, Jan 24 2016