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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 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 July 29 09:31 EDT 2021. Contains 346344 sequences. (Running on oeis4.)