The On-Line Encyclopedia of Integer Sequences (OEIS)

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A088618

Rearrangement of odd numbers such that every concatenation of at least two terms is composite.
(history; published version)

#5 by N. J. A. Sloane at Thu Dec 05 19:56:34 EST 2013

AUTHOR

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

Discussion

Thu Dec 05

19:56

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

#4 by Russ Cox at Fri Mar 30 17:29:12 EDT 2012

EXTENSIONS

More terms from _Ray Chandler (rayjchandler(AT)sbcglobal.net), _, Oct 18 2003

Discussion

Fri Mar 30

17:29

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

#3 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

OFFSET

0,1,2

KEYWORD

base,nonn,new

#2 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), Oct 18 2003

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

NAME

Rearrangement of odd numbers such that every concatenation of at least two terms is composite.

DATA

1, 5, 13, 3, 15, 9, 17, 7, 23, 19, 25, 35, 21, 39, 37, 11, 33, 45, 27, 47, 31, 51, 41, 55, 29, 43, 61, 59, 57, 53, 49, 63, 65, 75, 67, 71, 69, 79, 77, 81, 73, 85, 91, 95, 83, 97, 105, 87, 101, 99, 115, 107, 93, 123, 111, 117, 113, 109, 119, 103, 121, 125, 129, 135, 133, 137

OFFSET

0,2

COMMENTS

Conjecture: Sequence is infinite. And every odd number is a member.

EXAMPLE

15,513,133,315,1513,5133,13315,15133,513315,1513315 all are composite.

KEYWORD

base,nonn

AUTHOR

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

EXTENSIONS

More terms from Ray Chandler (RayChandler(AT)alumni.tcu.edu), Oct 18 2003

STATUS

approved