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A114019 Largest n-digit prime whose digit reversal is also prime. 3
7, 97, 991, 9967, 99989, 999983, 9999971, 99999827, 999999893, 9999999967, 99999999977, 999999999959, 9999999999799, 99999999999959, 999999999999877, 9999999999999571, 99999999999997997, 999999999999999737 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

f[n_] := Block[{k = 10^n}, While[ !PrimeQ[k] || !PrimeQ[FromDigits@Reverse@IntegerDigits@k], k-- ]; k]; Array[f, 19] (* Robert G. Wilson v *)

CROSSREFS

Cf. A113018.

Sequence in context: A071361 A007810 A146758 * A178007 A241206 A127892

Adjacent sequences:  A114016 A114017 A114018 * A114020 A114021 A114022

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Nov 12 2005

EXTENSIONS

More terms from Robert G. Wilson v, Nov 19 2005

STATUS

approved

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Last modified September 26 05:00 EDT 2020. Contains 337346 sequences. (Running on oeis4.)