The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A037354 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A037354

Numbers whose base-4 and base-7 expansions have no digits in common.
(history; published version)

#11 by Joerg Arndt at Sun Jun 20 08:25:04 EDT 2021

STATUS

proposed

approved

#10 by Jon E. Schoenfield at Sun Jun 20 05:14:03 EDT 2021

STATUS

editing

proposed

#9 by Jon E. Schoenfield at Sun Jun 20 05:14:01 EDT 2021

NAME

Numbers n such that no whose base -4 digit of n is a and base -7 digit of nexpansions have no digits in common.

MATHEMATICA

Select[Range[500], Intersection[IntegerDigits[#, 4], IntegerDigits[#, 7]]=={}&] (* Vincenzo Librandi, Jun 07 2012 *)

STATUS

approved

editing

#8 by Joerg Arndt at Fri Jun 08 00:48:47 EDT 2012

STATUS

proposed

approved

#7 by Vincenzo Librandi at Thu Jun 07 14:23:20 EDT 2012

STATUS

editing

proposed

#6 by Vincenzo Librandi at Thu Jun 07 14:23:16 EDT 2012

LINKS

Vincenzo Librandi, <a href="/A037354/b037354.txt">Table of n, a(n) for n = 1..1000</a>

MATHEMATICA

Select[Range[500], Intersection[IntegerDigits[#, 4], IntegerDigits[#, 7]]=={}&] (* Vincenzo Librandi, Jun 07 2012 *)

STATUS

approved

editing

#5 by Russ Cox at Fri Mar 30 18:56:28 EDT 2012

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

Clark Kimberling

Discussion

Fri Mar 30

18:56

OEIS Server: https://oeis.org/edit/global/285

#4 by N. J. A. Sloane at Thu Feb 19 03:00:00 EST 2004

NAME

Numbers n-th number k such that no base 4 digit of k n is a base 7 digit of kn.

KEYWORD

nonn,base,new

#3 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

KEYWORD

nonn,base,new

AUTHOR

Clark Kimberling, (ck6(AT)evansville.edu)

#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

nth n-th number k such that no base 4 digit of k is a base 7 digit of k.

KEYWORD

nonn,base,new

AUTHOR

Clark Kimberling, ck6@cedar.(AT)evansville.edu