A088618 Rearrangement of odd numbers such that every concatenation of at least two terms is composite.

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

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