%I
%S 1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,12,12,14,14,16,16,18,18,20,
%T 21,21,23,23,25,25,27,27,29,29,31,32,32,34,34,36,36,38,38,40,41,41,43,
%U 43,45,45,47,47,49,49,51,52,52,54,54,56,56,58,58,60,61,61,63,63
%N A selfdescribing sequence.
%F There are a(n) digits having the same parity as a(n) in the interval ]0;a(n)+1[.
%e Pick the first "4" in the sequence; "4" is even; there are 4 even digits in the interval ]0;5[ > 2,2,4 and 4.
%e Take "21", which is odd; there are 21 odd digits in the interval ]0;22[ > 1 3 3 5 5 7 7 9 9 1 1 1 1 1 1 1 1 1 1 1 and 1 = 21.
%K base,easy,nonn
%O 0,2
%A _Eric Angelini_, Aug 09 2005; revised Aug 25 2005
