login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A262582 Concatenation of the numbers from 1 to n but omitting 12. 18
1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 12345678910, 1234567891011, 123456789101113, 12345678910111314, 1234567891011131415, 123456789101113141516, 12345678910111314151617, 1234567891011131415161718, 123456789101113141516171819, 12345678910111314151617181920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The first (probable) prime in this sequence is a(960) = 1234567891011131415...961 (ending in 961), found by David Broadhurst, Sep 28 2015.

LINKS

Table of n, a(n) for n=1..19.

CROSSREFS

Cf. A007908, A262299, A262300, A262571-A262582.

See A262300 for more about this problem.

Sequence in context: A060555 A138957 A007908 * A262581 A262580 A262579

Adjacent sequences:  A262579 A262580 A262581 * A262583 A262584 A262585

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Sep 25 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 22 15:37 EDT 2017. Contains 286877 sequences.