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A111382 Beginning with 3, least number such that concatenation of first n terms and its digit reversal both are primes. 2
3, 1, 1, 21, 11, 43, 47, 157, 753, 51, 917, 273, 2409, 703, 413, 3729, 1153, 6243, 8789, 2307, 4477, 137, 403, 10649, 4617, 4533, 6133, 4721, 877, 2469, 5967, 1557, 1047, 38931, 15533, 6877, 23987, 4767, 18049, 1463, 118333, 27897 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

CROSSREFS

Cf. A113584.

Sequence in context: A121412 A212855 A016561 * A173884 A176418 A156950

Adjacent sequences:  A111379 A111380 A111381 * A111383 A111384 A111385

KEYWORD

nonn,base

AUTHOR

Hans Havermann, Nov 08 2005

STATUS

approved

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Last modified December 17 09:23 EST 2018. Contains 318193 sequences. (Running on oeis4.)