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 A102494 #13 Feb 16 2025 08:32:55 %S A102494 10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32, %T A102494 33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55, %U A102494 56,57,58,59,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88 %N A102494 Numbers in base-60 representation that cannot be written with decimal digits. %D A102494 Mohammad K. Azarian, Meftah al-hesab: A Summary, MJMS, Vol. 12, No. 2, Spring 2000, pp. 75-95. Mathematical Reviews, MR 1 764 526. Zentralblatt MATH, Zbl 1036.01002. %D A102494 Mohammad K. Azarian, A Summary of Mathematical Works of Ghiyath ud-din Jamshid Kashani, Journal of Recreational Mathematics, Vol. 29(1), pp. 32-42, 1998. %H A102494 Harvey P. Dale, <a href="/A102494/b102494.txt">Table of n, a(n) for n = 1..1000</a> %H A102494 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Sexagesimal.html">Sexagesimal</a> %H A102494 Wikipedia, <a href="http://en.wikipedia.org/wiki/Sexagesimal">Sexagesimal</a> %e A102494 200 = 3*60^1 + 20*60^0 = '3K', therefore 200 is a term. %t A102494 Select[Range[100],Max[IntegerDigits[#,60]]>9&] (* _Harvey P. Dale_, Dec 27 2012 *) %o A102494 (Haskell) %o A102494 import Data.List (unfoldr) %o A102494 a102494 n = a102494_list !! (n-1) %o A102494 a102494_list = filter (any (> 9) . unfoldr %o A102494 (\x -> if x == 0 then Nothing else Just $ swap $ divMod x 60)) [0..] %o A102494 -- _Reinhard Zumkeller_, Jun 27 2013 %Y A102494 Complement of A102493; A102488, A102490, A102492. %K A102494 nonn,base %O A102494 1,1 %A A102494 _Reinhard Zumkeller_, Jan 12 2005