The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A020466 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
newer changes | Showing entries 11-20

A020466

Primes that contain digits 4 and 9 only.
(history; published version)

#10 by Alois P. Heinz at Wed Nov 20 21:41:18 EST 2019

LINKS

James Maynard and Brady Haran, <a href="https://www.youtube.com/watch?v=eeoBCS7IEqs">Primes without a 7</a>, Numberphile video (2019)

STATUS

approved

editing

#9 by N. J. A. Sloane at Fri Jul 27 21:30:22 EDT 2012

STATUS

proposed

approved

#8 by Vincenzo Librandi at Fri Jul 27 01:51:53 EDT 2012

STATUS

editing

proposed

#7 by Vincenzo Librandi at Fri Jul 27 01:51:47 EDT 2012

LINKS

Vincenzo Librandi, <a href="/A020466/b020466.txt">Table of n, a(n) for n = 1..1000</a>

MATHEMATICA

Flatten[Table[Select[FromDigits/@Tuples[{4, 9}, n], PrimeQ], {n, 8}]] (* Vincenzo Librandi, Jul 27 2012 *)

STATUS

approved

editing

#6 by Russ Cox at Fri Mar 30 18:35:14 EDT 2012

AUTHOR

_David W. Wilson (davidwwilson(AT)comcast.net)_

Discussion

Fri Mar 30

18:35

OEIS Server: https://oeis.org/edit/global/202

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

KEYWORD

nonn,base,new

AUTHOR

David W. Wilson (davidwwilson(AT)attbicomcast.comnet)

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

KEYWORD

nonn,base,new

AUTHOR

dww

David W. Wilson (davidwwilson(AT)attbi.com)

#3 by N. J. A. Sloane at Mon May 08 03:00:00 EDT 2000

KEYWORD

nonn,base,new

AUTHOR

wilson@ctron.com

dww

#2 by N. J. A. Sloane at Sun Jun 14 03:00:00 EDT 1998

REFERENCES

KEYWORD

nonn,base,new

AUTHOR

wilson@dalek.ctron.com

#1 by N. J. A. Sloane at Wed Dec 11 03:00:00 EST 1996

NAME

Primes that contain digits 4 and 9 only.

DATA

449, 499, 4999, 9949, 44449, 49499, 49999, 94949, 94999, 444449, 994949, 999499, 4444949, 4449449, 4944949, 4949449, 4999949, 4999999, 9444949, 9494999, 9944449, 9994499, 44444999, 44499449, 44944499, 44994949, 49444949, 49444999, 49494499

OFFSET

1,1

REFERENCES

KEYWORD

nonn,base

AUTHOR

wilson@dalek.ctron.com

STATUS

approved