145800

Appears in sequences

• Theta series of lattice Kappa_10.at n=10A015232
• Non-perfect powers k for which q = A051903(k)/A051904(k) is an integer, A051904(k) > 1.at n=20A093770
• Number of labeled n-node graphs with at most one cycle in each connected component.at n=7A133686
• a(n) = 4*a(n-1) - 4*a(n-2) + 2*a(n-4), with a(0)=a(1)=a(2)=0, and a(3)=1.at n=15A135248
• Totally multiplicative sequence with a(p) = 9*(p+3) for prime p.at n=19A167328
• Numbers n such that tau(phi(n)) = sigma(rad(n)).at n=36A173745
• Number of 0..7 arrays of length n with each element differing from at least one neighbor by something other than 1.at n=5A221572
• Number of 0..n arrays of length 6 with each element differing from at least one neighbor by something other than 1.at n=6A221576
• T(n, m), denominators of coefficients in a power/Fourier series expansion of the plane pendulum's exact phase space trajectory.at n=17A273507
• Composite numbers k such that sum of proper divisors of k divides 2^k-1.at n=15A278315
• Fixed points of A300956.at n=21A300958
• The third power of the unsigned Lah triangular matrix A105278.at n=16A308281
• Primitive coreful 3-abundant numbers: coreful 3-abundant numbers (A340109) that are powerful numbers (A001694).at n=36A364991
• Let M_n be the n X n matrix M_(i,j)=1/(3^i+3^j), then a(n) is the denominator of det(M_n).at n=2A379913
• Achilles numbers with a primorial squarefree kernel that are not products of primorials.at n=33A386433