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A114316 Self-describing 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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 19 16:00 EDT 2018. Contains 316365 sequences. (Running on oeis4.)