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 A059805 #17 Feb 13 2025 19:16:23
%S A059805 12,34,56,78,91,1,11,21,31,41,51,61,71,81,92,2,12,22,32,42,52,62,72,
%T A059805 82,93,3,13,23,33,43,53,63,73,83,94,4,14,24,34,44,54,64,74,84,95,5,15,
%U A059805 25,35,45,55,65,75,85,96,6,16,26,36,46,56,66,76,86,97,7,17,27,37,47,57,67
%N A059805 Natural numbers written with digits grouped in pairs and leading zeros omitted.
%H A059805 Rémy Sigrist, <a href="/A059805/b059805.txt">Table of n, a(n) for n = 1..10000</a>
%F A059805 a(2n-1)*100 + a(2n) = A091332(n); a(2n-1) = floor(A091332(n)/100), a(2n) = (A091332(n) mod 100). - _M. F. Hasler_, Oct 23 2014
%t A059805 FromDigits /@ Partition[ Flatten[ IntegerDigits[ Table[ n, {n, 1, 77}]]], 2] (* _Robert G. Wilson v_ *)
%t A059805 FromDigits/@Partition[Flatten[IntegerDigits/@Range[100]],2] (* _Harvey P. Dale_, Feb 13 2025 *)
%o A059805 (PARI) {c=0; d=[]; for(n=1, 99, while(#d<2, d=concat(d, digits(c++))); print1(d[1],d[2]", "); d=vecextract(d, "^..2"))} \\ _M. F. Hasler_, Oct 23 2014
%Y A059805 Cf. A000027, A087406, A060936, A087407, A087408, A087409, A087075, A087410, A087411.
%Y A059805 Cf. A091331, A091332.
%K A059805 easy,base,nonn
%O A059805 1,1
%A A059805 Kazimierz Kurz (kurzk(AT)prokom.pl), Mar 01 2001
%E A059805 More terms from _Jason Earls_, Mar 24 2001