The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A262300 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A262300

Let S(n,k) denote the number formed by concatenating the decimal numbers 1,2,3,...,k, but omitting n; a(n) is the smallest k for which S(n,k) is prime, or -1 if no term in S(n,*) is prime.
(history; published version)

#66 by N. J. A. Sloane at Sun Nov 04 20:29:08 EST 2018

STATUS

editing

approved

#65 by N. J. A. Sloane at Sun Nov 04 20:28:15 EST 2018

COMMENTS

a(13) > is either -1 or greater than 40000. - Robert Price, Nov 03 2018

STATUS

reviewed

editing

Discussion

Sun Nov 04

20:29

N. J. A. Sloane: a(13) could still be -1, right?  So I changed the comment - hope that is OK!

#64 by Michel Marcus at Sun Nov 04 09:05:03 EST 2018

STATUS

proposed

reviewed

#63 by Robert Price at Sun Nov 04 08:47:21 EST 2018

STATUS

editing

proposed

#62 by Robert Price at Sun Nov 04 08:47:13 EST 2018

COMMENTS

a(13) > 40000. _- _Robert Price_, Nov 03 2018

#61 by Jon E. Schoenfield at Sun Nov 04 01:51:10 EDT 2018

STATUS

proposed

editing

#60 by Robert Price at Sat Nov 03 21:52:24 EDT 2018

STATUS

editing

proposed

Discussion

Sun Nov 04

01:51

Jon E. Schoenfield: incorrect signature format

#59 by Robert Price at Sat Nov 03 21:52:14 EDT 2018

COMMENTS

a(13) > 40000. Robert Price, Nov 03 2018

STATUS

approved

editing

#58 by Michel Marcus at Sun Oct 28 03:22:28 EDT 2018

STATUS

reviewed

approved

#57 by Joerg Arndt at Sun Oct 28 03:20:09 EDT 2018

STATUS

proposed

reviewed