76640

Appears in sequences

• Larger of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=25A323330
• Numbers k such that A001414(k+1) = A001414(k)+1 and A001414(k)^2+3*A001414(k)+1 is prime.at n=20A352581
• a(n) = Sum_{p <= n <= q < 2n, p,q prime} (p * q).at n=35A352777
• The indices where A354606(n) = 1.at n=44A355606