A332554 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A332554

a(n) = (n*(n+1)/2)/Q(n) - (Q(n)+1)/2, where Q(n) = A332547(n).

2, 5, 9, 3, 5, 27, 10, 6, 8, 20, 24, 9, 11, 21, 135, 12, 14, 35, 6, 15, 17, 90, 12, 18, 20, 7, 54, 21, 23, 495, 42, 24, 26, 19, 69, 27, 29, 44, 161, 30, 32, 80, 13, 33, 35, 374, 45, 17, 38, 14, 99, 39, 10, 26, 65, 42, 44, 110, 114, 45, 47, 85, 153, 11

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,1

COMMENTS

Michael J. Collins showed that this is an upper bound on A082183 (see Comments in A082183).

LINKS

Table of n, a(n) for n=2..65.

CROSSREFS

Sequence in context: A347345 A324835 A082183 * A333530 A111474 A111761

Adjacent sequences: A332551 A332552 A332553 * A332555 A332556 A332557

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 21 2020, following a suggestion from Michael J. Collins, Feb 19 2020

STATUS

approved