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A103169 Start of seven consecutive primes whose digit reversals are also prime. 4
2, 727, 733, 1193, 1201, 1213, 1217, 11897, 18719, 79379, 125627, 334759, 334771, 743989, 910909, 920957, 928429, 941449, 1093571, 1215079, 1407181, 1466533, 1518863, 1648553, 1770829, 3170743, 3300593, 7321943, 7682687, 7755581 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

1193, 1201, 1213, 1217, 1223, 1229 and 1231 are consecutive primes.

Their digit reversals, 3911, 1021, 3121, 7121, 3221, 9221 and 1321, are all prime.

MATHEMATICA

With[{s = Prime@ Range[10^6]}, IntegerReverse /@ Flatten@ Map[Take[#, Length@ # - 6] &, DeleteCases[SplitBy[Map[IntegerReverse, s], PrimeQ], k_ /; Or[CompositeQ@ First@ k, Length@ k < 7]]]] (* Michael De Vlieger, Jul 24 2017 *)

CROSSREFS

Cf. A007500, A103170, A103171, A103172.

Sequence in context: A153923 A167440 A156008 * A082438 A062066 A174368

Adjacent sequences:  A103166 A103167 A103168 * A103170 A103171 A103172

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 October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)