OFFSET
1,1
COMMENTS
Numbers n such that A100073(n) >= 3; see there for more information & formulas.
LINKS
Metin Sariyar, Table of n, a(n) for n = 1..10000
Geoffrey Campbell, Numbers that are the difference of two squares in two or more ways, Number Theory Group on LinkedIn, July 8, 2018.
EXAMPLE
48 = 7^2 - 1^2 = 8^2 - 4^2 = 13^2 - 11^2.
MATHEMATICA
Select[Range[300], Length[FindInstance[x^2 - y^2 == # && x>y>0, {x, y}, Integers, 3 ]] == 3 &] (* Giovanni Resta, Jul 10 2018 *)
PROG
(PARI) select( is(n)=A100073(n)>2, [1..300])
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey B. Campbell and M. F. Hasler, Jul 10 2018
STATUS
approved