OFFSET
1,1
EXAMPLE
a(2)=9 because prime(9-1)=19 is a generalized cuban prime and prime(9+1)=29 is not.
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Juri-Stepan Gerasimov, Feb 11 2010
EXTENSIONS
84 inserted, 88 removed - R. J. Mathar, Mar 01 2010
Further corrections and edits from Charles R Greathouse IV, Mar 25 2010
STATUS
approved