

A102497


Primes of the concatenated form 1nn1 where n is an integer >=0.


3



112121, 113131, 115151, 119191, 127271, 131311, 134341, 136361, 140401, 142421, 145451, 149491, 157571, 158581, 161611, 169691, 170701, 172721, 178781, 182821, 187871, 190901, 191911, 196961, 197971, 1100010001, 1100210021, 1101710171
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OFFSET

1,1


LINKS



EXAMPLE

112121 is prime and is of the form 1nn1 for n=12.
1100010001 is prime and is of the form 1nn1 for n=1000.


CROSSREFS



KEYWORD

easy,nonn,base


AUTHOR

Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 12 2005


STATUS

approved



