216695104121
domain: N
Appears in sequences
- a(n) = 4*a(n-1) - a(n-2), with a(0) = 1, a(1) = 1.at n=21A001835
- a(n) = 4*a(n-1) - a(n-2) with a(1) = 1, a(2) = 3.at n=20A079935
- Numbers k such that k^2 is of the form 3*m^2 + 2*m + 1 (A056109).at n=10A122769
- Diagonals of a Euclidian solid such that there exists a Pythagorean quadruple d^2=a^2+b^2+c^2 that is more cube-like than any prior value of d.at n=29A375098