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A238980
Underline all odd digits of the sequence. The sequence gives the successive lengths of the underlined/not underlined blocks of digits.
0
1, 2, 4, 3, 5, 7, 9, 6, 8, 21, 11, 13, 20, 22, 24, 23, 15, 17, 19, 31, 26, 28, 40, 33, 35, 37, 39, 42, 44, 46, 48, 60, 62, 64, 66, 68, 80, 25, 51, 53, 55, 57, 59, 82, 84, 86, 88, 200, 201, 71, 73, 75, 77, 79, 91, 93, 95, 97, 10, 202, 204, 206, 208, 220, 222, 224, 99, 111, 113, 115, 117, 119, 131, 133, 12, 226, 228, 240, 242, 244, 246, 248, 27, 135, 137, 139, 151, 110, 260, 262, 264, 266, 268, 29, 153, 155, 157, 159, 171, 173, 280, 282, 284, 286, 288, 400, 402, 404, 406, 408, 41, 175, 177, 179, 191, 193, 195, 197, 199, 14
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
Sequence in context: A374800 A093506 A307485 * A327143 A343313 A082006
KEYWORD
nonn,base
AUTHOR
Eric Angelini, Mar 07 2014; corrected Jun 22 2015
STATUS
approved