The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A039041 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A039041

Numbers whose base-7 representation has the same number of 2's and 4's.
(history; published version)

#14 by Jon E. Schoenfield at Sun Jun 20 15:04:42 EDT 2021

STATUS

editing

approved

#13 by Jon E. Schoenfield at Sun Jun 20 15:04:41 EDT 2021

NAME

Numbers whose base-7 representation in base 7 has the same number of 2's and 4's.

STATUS

approved

editing

#12 by Alois P. Heinz at Tue Jun 23 10:36:51 EDT 2020

STATUS

proposed

approved

#11 by Daniel Starodubtsev at Tue Jun 23 10:31:10 EDT 2020

STATUS

editing

proposed

#10 by Daniel Starodubtsev at Tue Jun 23 10:31:05 EDT 2020

NAME

Numbers n such that whose representation in base 7 has the same number of 2's and 4's.

LINKS

Daniel Starodubtsev, <a href="/A039041/b039041.txt">Table of n, a(n) for n = 1..10000</a>

CROSSREFS

Cf. A007093.

STATUS

approved

editing

#9 by Charles R Greathouse IV at Thu Nov 21 12:46:45 EST 2013

MATHEMATICA

Select[Range[0, 200], DigitCount[#, 7, 2]==DigitCount[#, 7, 4]&] (* From _Harvey P. Dale, _, Dec 18 2011 *)

Discussion

Thu Nov 21

12:46

OEIS Server: https://oeis.org/edit/global/2062

#8 by Russ Cox at Fri Mar 30 17:20:51 EDT 2012

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com)

Olivier Gérard

Discussion

Fri Mar 30

17:20

OEIS Server: https://oeis.org/edit/global/117

#7 by Harvey P. Dale at Sun Dec 18 15:22:41 EST 2011

STATUS

editing

approved

#6 by Harvey P. Dale at Sun Dec 18 15:22:37 EST 2011

MATHEMATICA

Select[Range[0, 200], DigitCount[#, 7, 2]==DigitCount[#, 7, 4]&] (* From Harvey P. Dale, Dec 18 2011 *)

STATUS

approved

editing

#5 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,base,easy,new

AUTHOR

Olivier Gerard (ogerardolivier.gerard(AT)ext.jussieugmail.frcom)