The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A080697 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A080697

a(n) = n * prime(prime(n)).
(history; published version)

#31 by OEIS Server at Sat Jul 13 02:22:48 EDT 2024

LINKS

Amiram Eldar, <a href="/A080697/b080697_1.txt">Table of n, a(n) for n = 1..10000</a>

#30 by Joerg Arndt at Sat Jul 13 02:22:48 EDT 2024

STATUS

reviewed

approved

Discussion

Sat Jul 13

02:22

OEIS Server: Installed first b-file as b080697.txt.

#29 by Peter Luschny at Sat Jul 13 02:20:24 EDT 2024

STATUS

proposed

reviewed

#28 by Amiram Eldar at Sat Jul 13 02:01:30 EDT 2024

STATUS

editing

proposed

#27 by Amiram Eldar at Sat Jul 13 02:01:12 EDT 2024

COMMENTS

Sum of reciprocals converges to about 1/2. [More accurately, 0.50056748... . - _Amiram Eldar_, Jul 13 2024]

#26 by Amiram Eldar at Sat Jul 13 02:00:50 EDT 2024

EXAMPLE

a(1) = 1*prime(prime(1)) = 1*prime(2) = 1*3 = 3;.

#25 by Amiram Eldar at Sat Jul 13 02:00:34 EDT 2024

LINKS

Amiram Eldar, <a href="/A080697/b080697_1.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#24 by Charles R Greathouse IV at Thu Sep 08 08:45:09 EDT 2022

PROG

(MAGMAMagma) [n*NthPrime(NthPrime(n)): n in [1..40]]; // Vincenzo Librandi, Jun 09 2016

Discussion

Thu Sep 08

08:45

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

#23 by Bruno Berselli at Thu Jun 09 10:59:44 EDT 2016

STATUS

reviewed

approved

#22 by Joerg Arndt at Thu Jun 09 10:51:12 EDT 2016

STATUS

proposed

reviewed