[seqfan] Erasing... even number

[Eric Angelini]

Hello SeqFans,

E=1,2,2,3,2,4,5,3,2,6,7,4,8,9,5,3,2,10,11,6,12,13,7,4,14,15,8,16,17,9,5,3,2,18,19,10,20,21,11,6,22,23,12,24,25,13,7,4,26,27,14,28,29,15,8,30,31,...

1) Underline all integers that have an even number as left neighbour;
2) Erase all underlined integers;

... the remining integers rebuild E.

P.-S.
E is build such that the underlined integers appear in this "natural" order:
2,3,4,5,6,7,8,9,10,11,12,13,14,...

Best,
É.