391251

Appears in sequences

• sigma_4(n): sum of 4th powers of divisors of n.at n=24A001159
• Numerator of sum of -4th powers of divisors of n.at n=24A017671
• Numbers k such that k^2 is palindromic in base 5.at n=30A029988
• a(n) = Sum_{d|n, d==1 (mod 4)} d^4.at n=24A050448
• a(n) = Sum_{d|n, d==1 mod 4} d^4 - Sum_{d|n, d==3 mod 4} d^4.at n=24A050456
• a(n) = Sum_{d|n, n/d=1 mod 4} d^4.at n=24A050463
• a(n) = Sum_{d|n, n/d=1 mod 4} d^4 - Sum_{d|n, n/d=3 mod 4} d^4.at n=24A050468
• Sum of 4th powers of odd divisors of n.at n=24A051001
• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=25A059826
• A level 11 weight 5 form.at n=24A065103
• Numbers of the form (5^{mr}-1)/(5^r-1) for positive integers m, r.at n=18A076284
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=34A203173
• a(n) = (-1)^n * Sum_{2*m + 1 | 2*n + 1} (-1)^m (2*m + 1)^4.at n=12A204342
• a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^4.at n=24A279395
• a(n) = Sum_{d|n} (-1)^(n/d+1)*d^4.at n=24A284900
• a(0) = 0, a(n) = Sum_{0<d|n, n/d odd} d^4 for n > 0.at n=25A285989
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^4.at n=24A321560
• Sum of the 4th powers of the odd proper divisors of n.at n=49A352032
• Composite numbers of the form k^2+k+1 all of whose prime factors are of that same form.at n=21A353056
• Triangle read by rows: T(n, k) = Sum_{d=0..n-k} binomial(n, d)*StirlingS2(n-d, k)*624^(n-d-k), with 0 <= k <= n.at n=7A364073