Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

Revision History for A326183

(Underlined text is an addition; strikethrough text is a deletion.)

Showing all changes.
A326183 Numbers n for which A003961(n) <= A064989(sigma(A003961(n))), but which are not squares.
(history; published version)
#6 by Susanna Cuyler at Mon Jun 17 18:01:57 EDT 2019
STATUS

proposed

approved

#5 by Antti Karttunen at Mon Jun 17 13:21:14 EDT 2019
STATUS

editing

proposed

#4 by Antti Karttunen at Mon Jun 17 13:19:55 EDT 2019
COMMENTS

The largest prime factors (that are also unitary in case of 24 initial terms) are A006530(a(n)): 271, 389, 449, 523, 1091, 1151, 1193, 1201, 1231, 1319, 1373, 1451, 1619, 1637, 1871, 1987, 2131, 2339, 2467, 31, 2551, 2591, 2851, 2909.

CROSSREFS

Cf. A000203, A003961, A006530, A052126, A064989.

#3 by Antti Karttunen at Mon Jun 17 13:14:37 EDT 2019
COMMENTS

At least for 1 <= n <= 24 it holds that A052126(a(n)) is square, and moreover, apart from a(20), that square is 360000, while A052126(a(20)) = A052126(903960000) = 29160000.

CROSSREFS

Cf. A000203, A003961, A052126, A064989.

#2 by Antti Karttunen at Mon Jun 17 13:02:19 EDT 2019
NAME

allocatedNumbers n for which A003961(n) <= A064989(sigma(A003961(n))), but which are Anttinot Karttunensquares.

DATA

97560000, 140040000, 161640000, 188280000, 392760000, 414360000, 429480000, 432360000, 443160000, 474840000, 494280000, 522360000, 582840000, 589320000, 673560000, 715320000, 767160000, 842040000, 888120000, 903960000, 918360000, 932760000, 1026360000, 1047240000

OFFSET

1,1

LINKS

<a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a>

<a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a>

CROSSREFS

Setwise difference A326182 \ A000290.

Cf. A000203, A003961, A064989.

KEYWORD

allocated

nonn

AUTHOR

Antti Karttunen, Jun 17 2019

STATUS

approved

editing

#1 by Antti Karttunen at Thu Jun 13 13:06:12 EDT 2019
NAME

allocated for Antti Karttunen

KEYWORD

allocated

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 19 20:56 EDT 2024. Contains 375310 sequences. (Running on oeis4.)