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A262580 Concatenation of the numbers from 1 to n but omitting 10. 0
1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 123456789, 12345678911, 1234567891112, 123456789111213, 12345678911121314, 1234567891112131415, 123456789111213141516, 12345678911121314151617, 1234567891112131415161718, 123456789111213141516171819, 12345678911121314151617181920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The smallest prime in this sequence is the 61457-digit (probable) prime a(14512) = 123456789111213...14513 found by David Broadhurst on Sep 28 2015.

LINKS

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

CROSSREFS

Cf. A007908, A262299, A262571-A262582.

See A262300 for more about this problem.

Sequence in context: A007908 A262582 A262581 * A262579 A057932 A262578

Adjacent sequences:  A262577 A262578 A262579 * A262581 A262582 A262583

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Sep 25 2015

STATUS

approved

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Last modified July 21 17:51 EDT 2017. Contains 289643 sequences.