196964

Appears in sequences

• sigma_4(n): sum of 4th powers of divisors of n.at n=20A001159
• Numerator of sum of -4th powers of divisors of n.at n=20A017671
• Sum of n-th powers of divisors of 21.at n=4A034663
• Sum of fourth powers of unitary divisors.at n=20A034678
• Sum of 4th powers of odd divisors of n.at n=20A051001
• Sum of 4th powers of odd divisors of n.at n=41A051001
• Dirichlet inverse of sigma_4 function (A001159).at n=20A053826
• a(n) = n^4*Product_{distinct primes p dividing n} (1+1/p^4).at n=20A065960
• a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^4.at n=20A279395
• a(n) = Sum_{d|n} (-1)^(n/d+1)*d^4.at n=20A284900
• a(0) = 0, a(n) = Sum_{0<d|n, n/d odd} d^4 for n > 0.at n=21A285989
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^4.at n=20A321560
• Sum of the 4th powers of the squarefree divisors of n.at n=20A351267
• Sum of the 4th powers of the odd proper divisors of n.at n=41A352032