OFFSET
1,3
EXAMPLE
a(4) = 2 because the pairs (4, 4) and (5, 6) have the specified property: 4^4 - 4*4 = 0^2; 5^2 - 4*6 = 1^2, 6^2 - 4*5 = 4^2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jens Voß, Apr 27 2010
STATUS
approved