A114318 Self-describing sequence. See the sequence as a succession of digits: then a(n) is the position of a composite digit in the sequence.

2, 4, 5, 6, 8, 9, 14, 40, 50, 54, 55, 57, 70, 71, 72, 73, 75, 77, 100, 101, 102, 400, 500, 501, 540, 554, 604, 700, 701, 702, 703, 844, 854, 1400, 1500, 1501, 1502, 1503, 1505, 4440, 5000, 5001, 5002, 5003, 5005, 5007, 5010, 5011, 5012, 5013, 5015, 5017, 5020

Offset

1,1

Comments

"Composite" digits are : 4, 6, 8 and 9.

Links

Diana Mecum, Table of n, a(n) for n=1,...,148

Example

Composite digits are between brackets:
Sequence: 2,(4),5,(6),(8),(9),1(4),(4)0,50,5(4),55...
Digit pos: 2nd 4th 5th 6th 8th 9th 14th ... = sequence itself.

Crossrefs

Sequence in context: A080086 A229133 A015844 * A169956 A342495 A035500

Adjacent sequences: A114315 A114316 A114317 * A114319 A114320 A114321

Keyword

base,easy,nonn

Author

Eric Angelini, Feb 05 2006

Extensions

a(28)-a(148) from Diana L. Mecum, Dec 30 2008

Status

approved