A087595 Smallest n-digit member of A087593. Define dd(k) = the number formed by concatenating the absolute difference of successive digits of k. Sequence contains smallest n-digit prime p such that dd(p) is also prime.

13, 101, 1009, 10009, 100363, 1000003, 10000141, 100000543, 1000000007, 10000000589, 100000000447, 1000000000063, 10000000000609, 100000000000721, 1000000000000843, 10000000000002547, 100000000000000609

Offset

2,1

Comments

Conjecture: Sequence is infinite.

Links

Table of n, a(n) for n=2..18.

Example

a(5) = 10009 and dd(10009) = 1009 is a prime.

Crossrefs

Cf. A087593, A087594, A087596.

Sequence in context: A142297 A131021 A332907 * A117653 A004635 A369418

Adjacent sequences: A087592 A087593 A087594 * A087596 A087597 A087598

Keyword

base,nonn

Author

Amarnath Murthy, Sep 18 2003

Extensions

More terms from David Wasserman, Jun 15 2005

Status

approved