The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A354160 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A354160

Products of exactly two distinct primes in A090252, in order of appearance.
(history; published version)

#15 by Peter Luschny at Fri Jun 17 03:24:18 EDT 2022

STATUS

reviewed

approved

#14 by Michel Marcus at Fri Jun 17 00:14:26 EDT 2022

STATUS

proposed

reviewed

#13 by Michael De Vlieger at Thu Jun 16 18:45:02 EDT 2022

STATUS

editing

proposed

#12 by Michael De Vlieger at Thu Jun 16 18:44:29 EDT 2022

LINKS

Michael De Vlieger, <a href="/A354160/a354160.png">Annotated log-log scatterplot of A090252(n)</a>, n = 1..2^12, labeling primes in red, highlighting composite prime powers in gold, squarefree semiprimes in green and labeling them in boldface.

MATHEMATICA

Select[Import["https://oeis.org/A090252/b090252.txt", "Data"][[1 ;; 2000, -1]], PrimeNu[#] == PrimeOmega[#] == 2 &] (* Michael De Vlieger, Jun 16 2022 *)

STATUS

approved

editing

#11 by Alois P. Heinz at Wed Jun 15 16:47:57 EDT 2022

STATUS

proposed

approved

#10 by Michael De Vlieger at Wed Jun 15 16:36:52 EDT 2022

STATUS

editing

proposed

Discussion

Wed Jun 15

16:37

Michael De Vlieger: From Russ Cox's dataset.

#9 by Michael De Vlieger at Wed Jun 15 16:36:50 EDT 2022

LINKS

Michael De Vlieger, <a href="/A354160/b354160.txt">Table of n, a(n) for n = 1..2517</a>

STATUS

approved

editing

#8 by Joerg Arndt at Wed Jun 01 01:57:09 EDT 2022

STATUS

reviewed

approved

#7 by Michel Marcus at Wed Jun 01 01:56:16 EDT 2022

STATUS

proposed

reviewed

#6 by Chai Wah Wu at Tue May 31 17:10:24 EDT 2022

STATUS

editing

proposed