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 A000455 N0413 #40 Mar 23 2025 03:57:15 %S A000455 1,2,4,8,1,6,3,2,6,4,1,2,8,2,5,6,5,1,2,1,0,2,4,2,0,4,8,4,0,9,6,8,1,9, %T A000455 2,1,6,3,8,4,3,2,7,6,8,6,5,5,3,6,1,3,1,0,7,2,2,6,2,1,4,4,5,2,4,2,8,8, %U A000455 1,0,4,8,5,7,6,2,0,9,7,1,5,2 %N A000455 Digits of powers of 2. %C A000455 The number 0.a(0)a(1)a(2)...=0.124816... is a rich (or disjunctive) number. - _Robert FERREOL_, Apr 01 2020 %C A000455 The constant whose decimal expansion is this sequence is irrational (Mahler, 1981). - _Amiram Eldar_, Mar 23 2025 %D A000455 David Gale, Tracking the Automatic ANT And Other Mathematical Explorations, 1998, pp. 42-43. %D A000455 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %H A000455 N. J. A. Sloane, <a href="/A000455/b000455.txt">Table of n, a(n) for n = 0..9999</a> %H A000455 Archimedeans, <a href="https://archive.org/details/eureka-11/page/9/mode/2up">The Problems Drive</a>, Eureka, Vol. 11 (1949), p. 10, problem (5) B. %H A000455 Kurt Mahler, <a href="https://doi.org/10.1016/0022-314X(81)90010-X">On some irrational decimal fractions</a>, Journal of Number Theory, Vol. 13, No. 2 (1981), pp. 268-269. %t A000455 2^Range[0, 25] // IntegerDigits // Flatten (* _Jean-François Alcover_, Feb 08 2016 *) %o A000455 (Scala) (List.fill(32)(2: BigInt)).scanLeft(1: BigInt)(_ * _).map(_.toString.toCharArray).flatten.map(_.toInt - 48) // _Alonso del Arte_, Mar 28 2020 %Y A000455 Cf. A000079. %Y A000455 Cf. A008564, A008565, A008566, A008567, A008568, A008569, A008570, A008571, A008572, A008573, A010054. %K A000455 nonn,base,easy %O A000455 0,2 %A A000455 _N. J. A. Sloane_; entry revised by _N. J. A. Sloane_, Jun 10 2012