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 A229908 The least prime that has at least n embedded primes, reading forward and backward. 1
 2, 13, 13, 37, 113, 113, 137, 1237, 1373, 1733, 1733, 11317, 11731, 12713, 19973, 91733, 113173, 113371, 113371, 173347, 991733, 1123379, 1134673, 1137991, 1237199, 2333719, 7433719, 11133719, 11399173, 11399173, 11791733, 37914713, 97433719, 113217397, 113217397, 113337199, 113337199, 113337199, 1113371999, 1113371999, 1113991733, 1139917321, 1139917321, 1139917333 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Results of my search up to 2^32. LINKS Giovanni Resta, Table of n, a(n) for n = 1..65 (terms < 3.5*10^12) EXAMPLE Example: a(8) = 1237 because there are the following eight embedded primes: 1237, 2, 23, 3, 37, 7 and 73, 7321. CROSSREFS Cf. A039993, A039997. Sequence in context: A037055 A065584 A153651 * A320339 A075032 A032932 Adjacent sequences:  A229905 A229906 A229907 * A229909 A229910 A229911 KEYWORD nonn,base,hard AUTHOR Carlos Rivera, Dec 19 2013 EXTENSIONS Missing a(19) from Giovanni Resta, Jan 25 2014 STATUS approved

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Last modified January 28 03:49 EST 2020. Contains 331317 sequences. (Running on oeis4.)