-1729
domain: Z
Appears in sequences
- Expansion of Product_{k>=1} (1 - x^k)^14.at n=10A010821
- Expansion of -x - x^3*(2 -2*x^4 +x^5)/((1-x^2)*(1+x+x^4)).at n=24A089076
- Fourth column (m=3) of triangle A128494.at n=50A128498
- Fourth column (m=3) of triangle A128494.at n=51A128498
- Numerator of Bernoulli(n, -7/12).at n=3A159499
- Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n).at n=90A255644
- Let f(x) = 1 + Sum_{j>=4} (|mu(j)| - |mu(j-1)|)*x^j, where mu(n) is the Möbius function (A008683). Then a(n) is n times the coefficient of x^n in the expansion of log(f(x)).at n=36A262400
- Alternating sum of heptagonal numbers.at n=37A266085
- a(n) = Sum_{d|n} (-1)^(d-1)*d^2.at n=35A321543
- First term of n-th difference sequence of (floor(3e*k)), k >= 0.at n=13A325737