OFFSET
1,1
EXAMPLE
a(2)=3 because 3 terms are needed for a sum > 1:
(1/2)^2 + (2/3)^2 < 1, but (1/2)^2 + (2/3)^2 + (3/5)^2 > 1.
a(3)=6 because 6 terms are needed for a sum > 1:
(1/2)^3 + (2/3)^3 + (3/5)^3 + (4/7)^3 + (5/11)^3 + (6/13)^3 > 1.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, Apr 12 2021
EXTENSIONS
a(7) from Daniel Suteu, May 04 2021
STATUS
approved