The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A177512 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A177512

A053735-deficient numbers.
(history; published version)

#16 by Susanna Cuyler at Sun Sep 15 07:56:49 EDT 2019

STATUS

reviewed

approved

#15 by Michel Marcus at Sun Sep 15 05:55:09 EDT 2019

STATUS

proposed

reviewed

#14 by Amiram Eldar at Sun Sep 15 05:42:07 EDT 2019

STATUS

editing

proposed

#13 by Amiram Eldar at Sun Sep 15 05:38:42 EDT 2019

NAME

A053735-deficient numbers.

CROSSREFS

Cf. A177511 (perfect version), A175524, A175811, A000040, A005100, A005101.

#12 by Amiram Eldar at Sun Sep 15 05:38:17 EDT 2019

LINKS

Amiram Eldar, <a href="/A177512/b177512.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#11 by N. J. A. Sloane at Sat Feb 06 15:06:30 EST 2016

STATUS

proposed

approved

#10 by Michel Marcus at Sat Feb 06 14:40:34 EST 2016

STATUS

editing

proposed

#9 by Michel Marcus at Sat Feb 06 14:38:50 EST 2016

PROG

(PARI) isok(n) = sumdiv(n, d, (d<n)* vecsum(digits(d, 3))) < vecsum(digits(n, 3)); \\ Michel Marcus, Feb 06 2016

KEYWORD

nonn,base,changed

#8 by Michel Marcus at Sat Feb 06 14:38:18 EST 2016

PROG

(Sage) is_A177512 = lambda n: sum(A053735(d) for d in divisors(n)) < 2*A053735(n) # [_D. S. McNeil, _, Dec 11 2010]

STATUS

approved

editing

#7 by Russ Cox at Fri Mar 30 18:52:54 EDT 2012

AUTHOR

_Vladimir Shevelev (shevelev(AT)bgu.ac.il), _, Dec 11 2010

Discussion

Fri Mar 30

18:52

OEIS Server: https://oeis.org/edit/global/261