A114315 Self-describing sequence. See the sequence as a succession of digits: then a(n) is the position of a prime digit in the sequence.

4, 6, 8, 20, 21, 24, 40, 41, 44, 46, 48, 52, 60, 70, 80, 81, 84, 86, 88, 90, 102, 204, 305, 476, 485, 600, 649, 650, 660, 664, 667, 669, 686, 698, 720, 934, 2030, 2040, 4100, 4680, 5000, 6010, 6011, 6014, 6016, 6018, 6040, 6044, 6046, 6048, 6060

Offset

1,1

Comments

"Prime" digits are 2, 3, 5 and 7.

Links

Table of n, a(n) for n=1..51.

Example

Prime digits are between brackets:
Sequence: 4,6,8,(2)0,(2)1,(2)4,40,41,44,46,48,(5)(2),60,(7)0...
Digit pos: 4th 6th 8th 20 21st 24th ... = the sequence itself.

Crossrefs

Sequence in context: A279896 A247280 A226237 * A058238 A191697 A073437

Adjacent sequences: A114312 A114313 A114314 * A114316 A114317 A114318

Keyword

base,easy,nonn

Author

Eric Angelini, Feb 05 2006

Extensions

More terms from Ray G. Opao, Sep 23 2014

Status

approved