The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A373087

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

A373087

k is term if k is a square and its odd part is divisible by exactly two distinct primes.
(history; published version)

#20 by OEIS Server at Wed Jul 10 05:27:07 EDT 2024

LINKS

Paolo Xausa, <a href="/A373087/b373087_1.txt">Table of n, a(n) for n = 1..10000</a>

#19 by Peter Luschny at Wed Jul 10 05:27:07 EDT 2024

STATUS

proposed

approved

Discussion

Wed Jul 10

05:27

OEIS Server: Installed first b-file as b373087.txt.

#18 by Paolo Xausa at Wed Jul 10 05:07:39 EDT 2024

STATUS

editing

proposed

#17 by Paolo Xausa at Wed Jul 10 05:06:57 EDT 2024

LINKS

Paolo Xausa, <a href="/A373087/b373087_1.txt">Table of n, a(n) for n = 1..10000</a>

MATHEMATICA

Select[Range[200]^2, PrimeNu[#/2^IntegerExponent[#, 2]] == 2 &] (* Paolo Xausa, Jul 10 2024 *)

STATUS

approved

editing

#16 by Michael De Vlieger at Sat Jun 01 21:43:27 EDT 2024

STATUS

proposed

approved

#15 by Michel Marcus at Sat Jun 01 17:04:59 EDT 2024

STATUS

editing

proposed

#14 by Michel Marcus at Sat Jun 01 17:04:50 EDT 2024

CROSSREFS

Cf. A000290, A098904, A372724, A336101, A373087.

STATUS

approved

editing

Discussion

Sat Jun 01

17:04

Michel Marcus: Thank you Hugo

#13 by Charles R Greathouse IV at Sat Jun 01 15:30:43 EDT 2024

STATUS

proposed

approved

#12 by Hugo Pfoertner at Sat Jun 01 15:03:39 EDT 2024

STATUS

editing

proposed

#11 by Hugo Pfoertner at Sat Jun 01 15:03:12 EDT 2024

COMMENTS

The sequence b with terms of b(n)=2*sqrt(a(n)) are is a subsequence of A098904. - Hugo Pfoertner, Jun 01 2024