

A103171


Start of nine consecutive primes whose digit reversals are also prime.


3



1193, 1201, 7904639, 91528739, 91528777, 120890249, 154984343, 174625597, 302706311, 302706319, 312700789, 318629783, 707262887, 756791029, 777528457, 777528461, 778286917, 778286947, 923780981, 924408493, 924408497, 958610069
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OFFSET

1,1


COMMENTS

There are large gaps in this sequence because all terms begin with 1, 3, 7, or 9.


LINKS

Table of n, a(n) for n=1..22.


EXAMPLE

1193, 1201, 1213, 1217, 1223, 1229, 1231, 1237 and 1249 are consecutive primes.
Their digit reversals, 3911, 1021, 3121, 7121, 3221, 9221, 1321, 7321 and 9421, are all prime.


CROSSREFS

Cf. A007500, A103169, A103170, A103172.
Sequence in context: A299720 A300341 A040104 * A032530 A287049 A153379
Adjacent sequences: A103168 A103169 A103170 * A103172 A103173 A103174


KEYWORD

base,nonn


AUTHOR

Labos Elemer, Jan 31 2005


EXTENSIONS

Edited by David Wasserman, Sep 05 2006


STATUS

approved



