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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
OFFSET
1,1
COMMENTS
Results of my search up to 2^32.
LINKS
EXAMPLE
Example: a(8) = 1237 because there are the following eight embedded primes: 1237, 2, 23, 3, 37, 7 and 73, 7321.
CROSSREFS
Sequence in context: A065584 A153651 A369411 * A335972 A175270 A320339
KEYWORD
nonn,base,hard
AUTHOR
Carlos Rivera, Dec 19 2013
EXTENSIONS
Missing a(19) from Giovanni Resta, Jan 25 2014
STATUS
approved