The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A088423 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A088423

a(n) is the number of primes in arithmetic progression starting with 11 and with d = 2n.
(history; published version)

#13 by Peter Luschny at Sat May 29 05:59:51 EDT 2021

STATUS

proposed

approved

#12 by Jon E. Schoenfield at Fri May 28 18:28:48 EDT 2021

STATUS

editing

proposed

#11 by Jon E. Schoenfield at Fri May 28 18:28:46 EDT 2021

NAME

Number a(n) is the number of primes in arithmetic progression starting with 11 and with d = 2n.

COMMENTS

Arithmetic progression is stopped when next term is not prime. E.g. , for n=3, a=4, that is 11,17,23,29 are prime, while next term, 35, is not prime.

STATUS

proposed

editing

#10 by Felix Fröhlich at Fri May 28 10:51:37 EDT 2021

STATUS

editing

proposed

#9 by Felix Fröhlich at Fri May 28 10:51:27 EDT 2021

PROG

(PARI) a(n) = my(p=11, x=p+2*n, i=1); while(1, if(ispseudoprime(x), i++; x=x+2*n, return(i))) \\ Felix Fröhlich, May 28 2021

STATUS

proposed

editing

#8 by Michael De Vlieger at Thu May 27 16:58:19 EDT 2021

STATUS

editing

proposed

#7 by Michael De Vlieger at Thu May 27 16:57:53 EDT 2021

LINKS

Colin Adams, Chaim Even-Zohar, Jonah Greenberg, Reuben Kaufman, David Lee, Darin Li, Dustin Ping, Theodore Sandstrom, and Xiwen Wang, <a href="https://arxiv.org/abs/2103.08314">Virtual Multicrossings and Petal Diagrams for Virtual Knots and Links</a>, arXiv:2103.08314 [math.GT], 2021.

STATUS

proposed

editing

Discussion

Thu May 27

16:58

Michael De Vlieger: Added a b-file but my link pertains to A084423 instead.

#6 by Michael De Vlieger at Thu May 27 16:57:10 EDT 2021

STATUS

editing

proposed

#5 by Michael De Vlieger at Thu May 27 16:57:03 EDT 2021

LINKS

Michael De Vlieger, <a href="/A088423/b088423.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 17:26:10 EDT 2012

AUTHOR

_Zak Seidov (zakseidov(AT)yahoo.com), _, Sep 29 2003

Discussion

Fri Mar 30

17:26

OEIS Server: https://oeis.org/edit/global/139