OFFSET
1,4
COMMENTS
EXAMPLE
a(1)=0 because 1^1+1^1=2=prime and 0=1-1; a(2)=1 because 1^2+2^1=3=prime and 1=2-1; a(3)=1 because 2^3+3^2 and 1=3-2; a(4)=7 because 2^9+9^2 and 7=9-2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Mar 02 2010
EXTENSIONS
a(30) and a(32) corrected by R. J. Mathar, Mar 09 2010
STATUS
approved