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.

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, 75, 77, 78, 79, 91, 93, 95, 97, 98, 99, 111, 113, 115, 116, 117, 119, 131, 133, 134, 135, 137, 139, 151, 153, 211, 311, 313, 315, 317, 319, 411, 511, 513, 515, 517, 519, 530

Offset

1,1

Links

Table of n, a(n) for n=1..62.

Example

Runs of odd digits are between brackets:
Seq: 2,(3,5),6,(7,9,1)0,(11,13,1)4,(15,17,19),2(1,31,33,35),4(1,
Runs:....2........3.........5...........6............7.....= sequence itself.

Crossrefs

Cf. A135604.

Sequence in context: A380692 A380695 A083347 * A378724 A367625 A023705

Adjacent sequences: A137214 A137215 A137216 * A137218 A137219 A137220

Keyword

base,nonn

Author

Eric Angelini, Mar 06 2008

Status

approved