OFFSET
1,1
COMMENTS
For n > 1, a(n) is odd and a(n) != 5 mod 10. - Chai Wah Wu, Jun 17 2019
EXAMPLE
2,211,211333,2113331111,211333111199999 are all prime.
CROSSREFS
KEYWORD
base,more,nonn
AUTHOR
Amarnath Murthy, Dec 10 2003
EXTENSIONS
More terms from Max Alekseyev, Sep 04 2009
a(38)-a(51) from Chai Wah Wu, Jun 17 2019
STATUS
approved