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A110790
Copies of 3 and 1 alternately such that every partial concatenation is a prime.
3
3, 1, 3, 111111111111111, 33333, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111, 3333, 111111111111111111111111111, 33333
OFFSET
1,1
COMMENTS
The next term has 168 digits. - Charles R Greathouse IV, Sep 29 2008
EXAMPLE
3, 31, 313, 313111111111111111, ... are all prime.
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Aug 13 2005
EXTENSIONS
a(6)-a(9) from_Charles R Greathouse IV_, Sep 29 2008
STATUS
approved