The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A126332 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A126332

Numbers k such that 10k + 13 is prime.
(history; published version)

#26 by Joerg Arndt at Sat Feb 03 00:50:45 EST 2024

STATUS

editing

approved

#25 by Jon E. Schoenfield at Fri Feb 02 19:17:02 EST 2024

NAME

Numbers n k such that 10n 10k + 13 is prime.

EXAMPLE

If n For k = 100 then , 10*n k + 13 = 1013 (prime).

#24 by Paolo P. Lava at Fri Feb 02 07:40:59 EST 2024

COMMENTS

Solutions of the equation (10*n + 13)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Jan 03 2013

STATUS

approved

editing

#23 by Charles R Greathouse IV at Thu Sep 08 08:45:29 EDT 2022

PROG

(MAGMAMagma) [n: n in [0..1000] | IsPrime(10*n + 13)] // Vincenzo Librandi, Nov 23 2010

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#22 by Charles R Greathouse IV at Tue Jun 13 12:48:25 EDT 2017

STATUS

editing

approved

#21 by Charles R Greathouse IV at Tue Jun 13 12:47:55 EDT 2017

PROG

(PARI) is(n)=isprime(10*n+13) \\ Charles R Greathouse IV, Jun 13 2017

KEYWORD

nonn,easy

STATUS

approved

editing

#20 by N. J. A. Sloane at Mon Feb 10 01:27:29 EST 2014

STATUS

reviewed

approved

#19 by Alonso del Arte at Sun Feb 09 20:20:44 EST 2014

STATUS

proposed

reviewed

#18 by Alonso del Arte at Sun Feb 09 20:20:36 EST 2014

STATUS

editing

proposed

#17 by Alonso del Arte at Sun Feb 09 20:20:05 EST 2014

COMMENTS

Solutions of the equation (10*n + 13)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Jan 03 2013

FORMULA

a(k) = A102338(k+1) - 1. - R. J. Mathar, Jul 08 2009

EXAMPLE

If n = 100 then 10*n + 13 = 1013 (prime).

PROG

(MAGMA) [n: n in [0..1000] | IsPrime(10*n + 13)] [From _// _Vincenzo Librandi_, Nov 23 2010]

STATUS

proposed

editing