The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A177880 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A177880

Numbers k such that not all exponents in the prime power factorization of k are in A005836.
(history; published version)

#22 by Peter Luschny at Mon Aug 31 12:21:22 EDT 2020

STATUS

reviewed

approved

#21 by Joerg Arndt at Mon Aug 31 03:51:57 EDT 2020

STATUS

proposed

reviewed

#20 by Michel Marcus at Mon Aug 31 02:29:32 EDT 2020

STATUS

editing

proposed

#19 by Michel Marcus at Mon Aug 31 02:29:28 EDT 2020

PROG

is_A177880 = lambda n: not all(is_A005836(Integer(m)) for p, m in factor(n)) # [_D. S. McNeil, _, Dec 16 2010]

STATUS

proposed

editing

#18 by Amiram Eldar at Mon Aug 31 02:04:01 EDT 2020

STATUS

editing

proposed

#17 by Amiram Eldar at Mon Aug 31 01:41:34 EDT 2020

NAME

Numbers k such that not all exponents in the prime power factorization of k are in A005836.

LINKS

Amiram Eldar, <a href="/A177880/b177880.txt">Table of n, a(n) for n = 1..10000</a>

MATHEMATICA

Select[Range[200], AnyTrue[FactorInteger[#][[;; , 2]], DigitCount[#1, 3, 2] > 0 &] &] (* Amiram Eldar, Aug 31 2020 *)

CROSSREFS

Cf. A005836.

STATUS

approved

editing

#16 by Russ Cox at Sat Mar 31 14:00:56 EDT 2012

EXTENSIONS

Extended by _D. S. McNeil (mcneil(AT)hku.hk), _, Dec 16 2010

Discussion

Sat Mar 31

14:00

OEIS Server: https://oeis.org/edit/global/909

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

AUTHOR

_Vladimir Shevelev (shevelev(AT)bgu.ac.il), _, Dec 15 2010

Discussion

Fri Mar 30

18:52

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

#14 by D. S. McNeil at Thu Dec 16 07:24:55 EST 2010

STATUS

reviewed

approved

#13 by Alois P. Heinz at Thu Dec 16 07:01:55 EST 2010

STATUS

proposed

reviewed