69647

Appears in sequences

• a(n) = 2*n^4 - floor(2^(1/4)*n)^4.at n=38A257854
• Sequence of pairwise relatively prime numbers of class P_6 (see comment in A275246).at n=28A275251
• a(n) = Sum_{k=1..n} binomial(n,k)*phi(k), where phi is the Euler totient function.at n=13A306988
• Numbers k such that k and k+2 have the same unitary abundance (A129468).at n=14A335252