%I #12 Feb 22 2020 20:54:24
%S 1,2,3,4,5,6,7,8,9,10,14,1,17,130,21,50,15,28,180,33,20,37,2,200,42,
%T 52,47,270,162,60,57,310,300,3,66,350,35,73,380,78,400,41,84,302,4,91,
%U 460,96,480,22,104,510,110,530,115,5,55,122,580,53,132,146,136
%N A self-describing sequence: when the sequence is read as a string of decimal digits, a(n) gives the starting position of an occurrence of n. This sequence is the lexicographically earliest one with this property.
%C The sequence does not necessarily give the earliest position of a number.
%C For example, 1234 first appears at position 1, but a(1234) = 28011.
%H Paul Tek, <a href="/A263443/b263443.txt">Table of n, a(n) for n = 1..10000</a>
%H Paul Tek, <a href="/A263443/a263443.pl.txt">PERL program for this sequence</a>
%e The following table lists few first terms, with the corresponding digits induced in the overall sequence:
%e +----+------+------------------------------------------------------------+
%e | n | a(n) | New known digits |
%e +----+------+------------------------------------------------------------+
%e | 1 | 1 | 1 |
%e | 2 | 2 | 2 |
%e | 3 | 3 | 3 |
%e | 4 | 4 | 4 |
%e | 5 | 5 | 5 |
%e | 6 | 6 | 6 |
%e | 7 | 7 | 7 |
%e | 8 | 8 | 8 |
%e | 9 | 9 | 9 |
%e | 10 | 10 | 10 |
%e | 11 | 14 | 1411 |
%e | 12 | 1 | |
%e | 13 | 17 | 713 |
%e | 14 | 130 | 0 ... 14 |
%e | 15 | 21 | 215 |
%e | 16 | 50 | 0 16 |
%e | 17 | 15 | 15 |
%e | 18 | 28 | 2818 |
%e +----+------+------------------------------------------------------------+
%o (Perl) See Links section.
%Y Cf. A048991, A114315, A125132, A210423.
%K nonn,base
%O 1,2
%A _Paul Tek_, Oct 18 2015