A083995 a(1) = 9, 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).

9, 7, 1, 27, 3, 63, 191, 297, 207, 19, 3107, 147, 159, 5679, 4579, 2739, 2223, 8517, 8649, 2531, 1699, 3969, 797, 12883, 11013, 4811, 15657, 2719, 2231, 15391, 32711, 35931, 6861, 3927, 87, 6057, 2083, 19943, 13389, 35679, 1653, 37519, 13347, 21567

Offset

0,1

Links

Table of n, a(n) for n=0..43.

Crossrefs

Cf. A083992, A083993, A083994.

Sequence in context: A298752 A154396 A069611 * A195357 A328968 A267316

Adjacent sequences: A083992 A083993 A083994 * A083996 A083997 A083998

Keyword

base,nonn

Author

Amarnath Murthy, May 23 2003

Extensions

More terms from Ray Chandler, Aug 03 2003

Status

approved