

A114316


Selfdescribing sequence. See the sequence as a succession of digits: then a(n) is the position of a nonprime digit in the sequence.


0



1, 3, 4, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 25, 27, 52, 53, 55, 57, 72, 73, 75, 77, 80, 202, 422
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OFFSET

1,2


COMMENTS

"Nonprime" digits are : 0, 1, 4, 6, 8 and 9.
There are also other valid sequences with this definition, for example 1, 3, 4, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 25, 27, 38, 40, 41, 42, 44,.. Apparently the NAME is insufficient to characterize the sequence.  R. J. Mathar, Jul 13 2013


LINKS

Table of n, a(n) for n=1..32.


EXAMPLE

Nonprime digits are between brackets:
Sequence: (1),3,(4),(6),7,(8),(9),(1)(0),(1)(1),(1)2,(1)4, ...
Digit pos: first third 4th 6th 7th 8th 9th 10th 11th 12th 14th ... = sequence itself.


CROSSREFS

Sequence in context: A092460 A092459 A039232 * A039176 A066533 A039130
Adjacent sequences: A114313 A114314 A114315 * A114317 A114318 A114319


KEYWORD

base,easy,more,nonn


AUTHOR

Eric Angelini, Feb 05 2006


STATUS

approved



