cp's OEIS Frontend

A137217 A self-describing sequence: 2 odd digits between two even, then 3 odd digits between two even, then 5 odd digits between two even, then 6, then 7... The length of each run of odd digits is given by the sequence itself (the smallest available integer is used when needed). Zero is an even digit.

%I A137217 #2 Mar 30 2012 18:49:53
%S A137217 2,3,5,6,7,9,10,11,13,14,15,17,19,21,31,33,35,41,51,53,55,57,61,71,73,
%T A137217 75,77,78,79,91,93,95,97,98,99,111,113,115,116,117,119,131,133,134,
%U A137217 135,137,139,151,153,211,311,313,315,317,319,411,511,513,515,517,519,530
%N A137217 A self-describing sequence: 2 odd digits between two even, then 3 odd digits between two even, then 5 odd digits between two even, then 6, then 7... The length of each run of odd digits is given by the sequence itself (the smallest available integer is used when needed). Zero is an even digit.
%e A137217 Runs of odd digits are between brackets:
%e A137217 Seq: 2,(3,5),6,(7,9,1)0,(11,13,1)4,(15,17,19),2(1,31,33,35),4(1,
%e A137217 Runs:....2........3.........5...........6............7.....= sequence itself.
%Y A137217 Cf. A135604.
%K A137217 base,nonn
%O A137217 1,1
%A A137217 _Eric Angelini_, Mar 06 2008