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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 18 22:39 EST 2019. Contains 329305 sequences. (Running on oeis4.)