A083994 a(1) = 7 then the smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise).

7, 1, 29, 3, 9, 73, 39, 3, 443, 547, 41, 913, 417, 219, 149, 3289, 237, 4503, 1559, 4297, 8747, 3003, 4213, 7163, 1147, 851, 957, 5589, 6819, 3931, 30653, 6157, 453, 8009, 2899, 26393, 15651, 81763, 11549, 101277, 17929, 130631, 10023, 10293, 139197

Offset

0,1

Links

Table of n, a(n) for n=0..44.

Crossrefs

Cf. A083992, A083993.

Sequence in context: A050301 A146996 A286895 * A301731 A379007 A228498

Adjacent sequences: A083991 A083992 A083993 * A083995 A083996 A083997

Keyword

base,nonn

Author

Amarnath Murthy, May 23 2003

Extensions

More terms from Ray Chandler, Aug 03 2003

Status

approved