707282

Appears in sequences

• sigma_4(n): sum of 4th powers of divisors of n.at n=28A001159
• a(n) = n^4 + 1.at n=29A002523
• Numerator of sum of -4th powers of divisors of n.at n=28A017671
• Sum of fourth powers of unitary divisors.at n=28A034678
• a(n) = Sum_{d|n, d==1 (mod 4)} d^4.at n=28A050448
• a(n) = Sum_{d|n, d==1 mod 4} d^4 - Sum_{d|n, d==3 mod 4} d^4.at n=28A050456
• a(n) = Sum_{d|n, n/d=1 mod 4} d^4.at n=28A050463
• a(n) = Sum_{d|n, n/d=1 mod 4} d^4 - Sum_{d|n, n/d=3 mod 4} d^4.at n=28A050468
• Sum of 4th powers of odd divisors of n.at n=28A051001
• a(n) = n^4*Product_{distinct primes p dividing n} (1+1/p^4).at n=28A065960
• Semiprimes of the form n^4 + 1.at n=15A186688
• a(n) = (-1)^n * Sum_{2*m + 1 | 2*n + 1} (-1)^m (2*m + 1)^4.at n=14A204342
• Numbers m such that sigma(m-1) is a prime.at n=34A270413
• a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^4.at n=28A279395
• a(n) = Sum_{d|n} (-1)^(n/d+1)*d^4.at n=28A284900
• a(0) = 0, a(n) = Sum_{0<d|n, n/d odd} d^4 for n > 0.at n=29A285989
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^4.at n=28A321560
• Sum of the 4th powers of the squarefree divisors of n.at n=28A351267
• a(1) = 2, a(n) = k + 1, where k is the least number greater than a(n-1) such that rad(k) | a(n-1), where rad(n) = A007947(n).at n=19A365324