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%I #9 Nov 28 2015 21:19:17
%S 2,4,5,6,8,9,14,40,50,54,55,57,70,71,72,73,75,77,100,101,102,400,500,
%T 501,540,554,604,700,701,702,703,844,854,1400,1500,1501,1502,1503,
%U 1505,4440,5000,5001,5002,5003,5005,5007,5010,5011,5012,5013,5015,5017,5020
%N Self-describing sequence. See the sequence as a succession of digits: then a(n) is the position of a composite digit in the sequence.
%C "Composite" digits are : 4, 6, 8 and 9.
%H Diana Mecum, <a href="/A114318/b114318.txt">Table of n, a(n) for n=1,...,148</a>
%e Composite digits are between brackets:
%e Sequence: 2,(4),5,(6),(8),(9),1(4),(4)0,50,5(4),55...
%e Digit pos: 2nd 4th 5th 6th 8th 9th 14th ... = sequence itself.
%K base,easy,nonn
%O 1,1
%A _Eric Angelini_, Feb 05 2006
%E a(28)-a(148) from _Diana L. Mecum_, Dec 30 2008
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