31228

Appears in sequences

• a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n-k+1), where k = [ n/2 ], s = (1, p(1), p(2), ...).at n=33A025099
• Gaps of 4 in sequence A038593 (lower terms).at n=3A038647
• a(n) = A077696(n+1)/A077696(n).at n=21A077697
• Number of distinct solutions of Sum_{i=1..3}(x(2i-1)*x(2i)) = 0 (mod n), with x() in 0..n-1.at n=15A180795
• Successive values x such that the Mordell elliptic curve x^3 - y^2 = d has extremal points with quadratic extension over the rationals.at n=8A200656
• Coordinates x of Mordell elliptic curves x^3-y^2 for primary extremal points with quadratic extensions over rationals.at n=6A201047
• Number of rooted trees with n nodes having some subtrees replaced by cycles.at n=14A213683