OFFSET
1,2
COMMENTS
A self-describing sequence. The sequence is always extended with the smallest unused integer not leading to a contradiction.
EXAMPLE
(1)(2,4)(3,5,7,9)(6,8,2)(1,11,13)(20,22,24,2)(3,15,17,19,31)... are the first blocks of underlined/not underlined digits; the successive lengths are 1, 2, 4, 3, 5, 7, 9, ... which is the sequence itself.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini, Mar 07 2014; corrected Jun 22 2015
STATUS
approved