40834

Appears in sequences

• sigma_4(n): sum of 4th powers of divisors of n.at n=13A001159
• Sum of fourth powers of unitary divisors.at n=13A034678
• Dirichlet inverse of sigma_4 function (A001159).at n=13A053826
• a(n) = n^4*Product_{distinct primes p dividing n} (1+1/p^4).at n=13A065960
• E.g.f. Sum_{d|M} (exp(d*x)-1)/d, M=14.at n=5A141013
• Numbers k such that 403*2^k+1 is prime.at n=32A323101
• Sum of the 4th powers of the squarefree divisors of n.at n=13A351267
• Sum of the 4th powers of the squarefree divisors of n.at n=27A351267
• a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * Stirling2(n,k).at n=6A390888