6526884

Appears in sequences

• Pythagorean spiral: a(n-1)+1, a(n) and a(n)+1 are the sides of a right triangle (a primitive Pythagorean triangle).at n=5A053631
• a(1)=3, a(n_even)=(a(n-1)^2-1)/2; a(n_odd)=a(n-1)+1.at n=9A076601
• Largest denominators in even Egyptian fraction representation of 1.at n=3A118017
• a(1)=3; for n>1, a(n) is such that a(1)^2+...+a(n)^2 = (1+a(n))^2.at n=5A127690