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%I #2 Mar 31 2012 13:46:53
%S 1,2,3,4,5,6,7,8,9,11,12,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,
%T 29,30,31,32,34,36,38,40,42,44,46,47,48,49,50,51,52,53,54,55,56,57,58,
%U 59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81
%N A self-describing sequence. Underline all a(n)th digits of the sequence (first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, eleventh digit, etc.) The non-underlined digits form the sequence itself.
%K base,easy,nonn
%O 1,2
%A _Eric Angelini_, Jun 09 2007
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