9045146753

Appears in sequences

• Consider the mapping f(a/b) = (a^2+b^2)/(a^2-b^2) from rationals to rationals. Starting with 2/1 (a=2, b=1) and applying the mapping to each new (reduced) rational number gives 2/1, 5/3, 17/8, 353/225, ... . Sequence gives values of the numerators.at n=5A081465
• Congruent number sequence starting from the Pythagorean triple (3,4,5).at n=5A358210