3800117

Appears in sequences

• Consider Pythagorean triples which satisfy X^2+(X+7)^2=Z^2; sequence gives increasing values of Z.at n=15A060569
• Consider all Pythagorean triples (X,X+7,Z); sequence gives Z values.at n=24A076294
• a(0)=-4, a(1)=5; thereafter a(n) = 2*a(n-1) + a(n-2).at n=17A221174
• Part of the positive proper solutions y of the Pell equation x^2 - 2*y^2 = - 7^2 based on the fundamental solution (x0, y0)= (1, 5).at n=8A254759