OFFSET
1,1
FORMULA
a(n) = SQRT(A106575(n)).
EXAMPLE
a(3)=4 because the third square which is the sum and the difference of two primes (16=4^2) is the 4th one in
the succession of the perfect squares (thus: index 4).
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Alexandre Wajnberg, May 09 2005
EXTENSIONS
Extended by Ray Chandler, May 12 2005
STATUS
approved