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A083996 a(1) = 1; then numbers such that the concatenation a(n)a(n-1)...a(2)a(1)a(2)...a(n-1)a(n) is a prime for n>1. 7
1, 3, 9, 3, 11, 1, 23, 49, 21, 3, 17, 9, 13, 3, 47, 19, 41, 43, 3, 51, 371, 183, 3, 21, 103, 53, 33, 33, 91, 41, 99, 433, 443, 93, 111, 501, 73, 11, 139, 177, 171, 429, 521, 333, 417, 1, 341, 213, 253, 171, 387, 171, 779, 463, 687, 861, 1131, 39, 539, 231, 1513, 263, 369 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..62.

CROSSREFS

Cf. A083997, A083998, A083999, A084000, A083401.

Sequence in context: A097665 A284564 A170862 * A010259 A255583 A339882

Adjacent sequences:  A083993 A083994 A083995 * A083997 A083998 A083999

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, May 23 2003

EXTENSIONS

More terms from Ray Chandler, Jun 22 2003, Aug 03 2003

STATUS

approved

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Last modified March 4 05:42 EST 2021. Contains 341779 sequences. (Running on oeis4.)