A089330 a(1) = 1, a(n) = smallest multiple of n such that the concatenation (n>1) a(n)a(n-1)... a(2) a(1) is a prime.

1, 4, 6, 8, 30, 6, 91, 8, 54, 10, 11, 12, 481, 294, 60, 80, 34, 612, 342, 200, 462, 1606, 644, 1392, 1425, 1924, 216, 560, 3219, 120, 4123, 11904, 1254, 170, 3780, 468, 2442, 1672, 936, 11880, 861, 2352, 1935, 7524, 3825, 16238, 2256, 9120, 6909, 8950, 1122

Offset

1,2

Links

Table of n, a(n) for n=1..51.

Example

41,641,8641,308641, etc. are primes.

Crossrefs

Sequence in context: A278374 A300658 A366557 * A227553 A108270 A019161

Adjacent sequences: A089327 A089328 A089329 * A089331 A089332 A089333

Keyword

base,nonn

Author

Amarnath Murthy, Nov 04 2003

Extensions

More terms from David Wasserman, Sep 13 2005

Status

approved