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

Author

Eric Angelini, Feb 05 2006

Keywords

• base
• easy
• nonn

Comments

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

Examples

			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.
		

Extensions

More terms from Ray G. Opao, Sep 23 2014