The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A107609 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A107609

a(n) = round(n / pi(n)) = round(A000027(n) / A000720(n)).
(history; published version)

#20 by N. J. A. Sloane at Sat Aug 21 13:12:29 EDT 2021

STATUS

proposed

approved

#19 by Michel Marcus at Sat Aug 21 09:57:28 EDT 2021

STATUS

editing

proposed

#18 by Michel Marcus at Sat Aug 21 09:57:24 EDT 2021

CROSSREFS

Cf. A000720, A107610, A107614, A272231.

STATUS

proposed

editing

#17 by Alois P. Heinz at Sat Aug 21 09:42:50 EDT 2021

STATUS

editing

proposed

#16 by Alois P. Heinz at Sat Aug 21 09:39:35 EDT 2021

COMMENTS

This sequence grows very slowly. The first n for which a(n) = 5 is 190, then 556 for 6, 1821 for 7, etc. - _Alonso del Arte, _, Feb 27 2012

STATUS

proposed

editing

Discussion

Sat Aug 21

09:42

Alois P. Heinz: 2.5 is rounded down ... so here a(10)=2; A272231(10)=3 ...

#15 by Alois P. Heinz at Sat Aug 21 09:27:59 EDT 2021

STATUS

editing

proposed

#14 by Alois P. Heinz at Sat Aug 21 09:27:48 EDT 2021

CROSSREFS

Cf. A107610, A107614, A272231.

STATUS

proposed

editing

#13 by Jon E. Schoenfield at Sat Aug 21 08:53:15 EDT 2021

STATUS

editing

proposed

Discussion

Sat Aug 21

09:27

Alois P. Heinz: A272231 has the same definition, but they differ ...

#12 by Jon E. Schoenfield at Sat Aug 21 08:53:00 EDT 2021

NAME

a(n) = round( n / pi(n)) = round( A000027(n) / A000720(n) ).

COMMENTS

This sequence grows very slowly. First The first n for which a(n) = 5 is 190, then 556 for 6, 1821 for 7, etc. - Alonso del Arte, Feb 27 2012

STATUS

approved

editing

#11 by Russ Cox at Fri Mar 30 18:40:28 EDT 2012

AUTHOR

_Jonathan Vos Post (jvospost3(AT)gmail.com) _ and Robert G. Wilson v, May 17 2005

Discussion

Fri Mar 30

18:40

OEIS Server: https://oeis.org/edit/global/228