The On-Line Encyclopedia of Integer Sequences (OEIS)

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A089710

a(1) = 3. For n > 1, a(n) is the least unused number such that the concatenation a(n)a(n-1)...a(2)a(1) is prime.
(history; published version)

#8 by N. J. A. Sloane at Thu Dec 05 19:56:36 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Nov 17 2003

Discussion

Thu Dec 05

19:56

OEIS Server: https://oeis.org/edit/global/2075

#7 by Russ Cox at Fri Mar 30 17:29:13 EDT 2012

EXTENSIONS

More terms from _Ray Chandler (rayjchandler(AT)sbcglobal.net), _, Nov 21 2003

Discussion

Fri Mar 30

17:29

OEIS Server: https://oeis.org/edit/global/154

#6 by Russ Cox at Fri Mar 30 17:28:18 EDT 2012

EXTENSIONS

Edited by _Charles R Greathouse IV (charles.greathouse(AT)case.edu), _, Apr 29 2010

Discussion

Fri Mar 30

17:28

OEIS Server: https://oeis.org/edit/global/147

#5 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

Beginning with a(1) = 3, rearrangement of natural numbers . For n > 1, a(n) is the least unused number such that every the concatenation a(n)a(n-1)...a(2)a(1) is prime.

COMMENTS

Is this a rearrangement of the natural numbers?

EXTENSIONS

Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 29 2010

#4 by N. J. A. Sloane at Fri Jan 12 03:00:00 EST 2007

KEYWORD

base,nonn,new

EXTENSIONS

More terms from Ray Chandler (RayChandlerrayjchandler(AT)alumni.tcusbcglobal.edunet), Nov 21 2003

#3 by N. J. A. Sloane at Wed Dec 06 03:00:00 EST 2006

EXAMPLE

3, 13, 613, 9613, 49613, 2049613, ... etc. are primeprimes.

KEYWORD

base,nonn,new

#2 by N. J. A. Sloane at Tue Jan 24 03:00:00 EST 2006

EXAMPLE

3, 13, 613, 9613, 49613, 2049613, ... etc . are prime.

KEYWORD

base,nonn,new

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

NAME

Beginning with 3, rearrangement of natural numbers such that every concatenation a(n)a(n-1)...a(2)a(1) is prime.

DATA

3, 1, 6, 9, 4, 20, 13, 29, 19, 2, 7, 18, 12, 41, 36, 30, 72, 25, 27, 8, 28, 42, 47, 114, 85, 38, 16, 117, 177, 24, 11, 66, 34, 53, 37, 264, 48, 126, 96, 87, 39, 261, 99, 65, 124, 419, 21, 147, 55, 321, 240, 62, 40, 69, 92, 60, 49, 287, 289, 393, 227, 745, 84, 149, 58, 54, 141

OFFSET

1,1

EXAMPLE

3, 13, 613, 9613, 49613, 2049613, ... etc are prime.

CROSSREFS

Cf. A089711.

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 17 2003

EXTENSIONS

More terms from Ray Chandler (RayChandler(AT)alumni.tcu.edu), Nov 21 2003

STATUS

approved