A088618 - OEIS

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A088618

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

0

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

LINKS

Table of n, a(n) for n=1..66.

EXAMPLE

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

CROSSREFS

Sequence in context: A035412 A338985 A065865 * A121645 A057691 A297903

Adjacent sequences: A088615 A088616 A088617 * A088619 A088620 A088621

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Oct 17 2003

EXTENSIONS

More terms from Ray Chandler, Oct 18 2003

STATUS

approved