The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A348952 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A348952

a(n) = -Sum_{d|n, d < sqrt(n)} (-1)^(d + n/d).
(history; published version)

#13 by Michael De Vlieger at Tue Dec 14 12:10:33 EST 2021

STATUS

proposed

approved

#12 by Antti Karttunen at Tue Dec 14 11:29:09 EST 2021

STATUS

editing

proposed

#11 by Antti Karttunen at Tue Dec 14 11:08:55 EST 2021

LINKS

Antti Karttunen, <a href="/A348952/b348952.txt">Table of n, a(n) for n = 1..20000</a>

CROSSREFS

Cf. A048272, A056924, A228441, A258453, A305152, A333809, A348515, A348951, A348953, A348954, A348955, A348956.

STATUS

approved

editing

#10 by Joerg Arndt at Tue Nov 23 01:49:59 EST 2021

STATUS

reviewed

approved

#9 by Michel Marcus at Mon Nov 22 14:50:11 EST 2021

STATUS

proposed

reviewed

#8 by Bernard Schott at Mon Nov 22 14:20:33 EST 2021

STATUS

editing

proposed

#7 by Bernard Schott at Mon Nov 22 14:20:03 EST 2021

FORMULA

For p odd prime, a(p) = a(p^2) = -1. - Bernard Schott, Nov 22 2021

STATUS

approved

editing

Discussion

Mon Nov 22

14:20

Bernard Schott: One formula.

#6 by Susanna Cuyler at Fri Nov 05 21:11:38 EDT 2021

STATUS

proposed

approved

#5 by Antti Karttunen at Fri Nov 05 13:53:11 EDT 2021

STATUS

editing

proposed

#4 by Antti Karttunen at Fri Nov 05 13:53:05 EDT 2021

PROG

(PARI) A348952(n) = -sumdiv(n, d, if((d*d)<n, (-1)^(d + (n/d)), 0)); \\ Antti Karttunen, Nov 05 2021

STATUS

proposed

editing