31360

Appears in sequences

• Expansion of theta_3 / theta_4.at n=21A007096
• Triangle of coefficients in expansion of (4+7x)^n.at n=17A013625
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*4^j.at n=18A038270
• McKay-Thompson series of class 32A for Monster.at n=43A058629
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 6 (most significant digit on right).at n=15A061935
• Numbers whose product of exponents is equal to the sum of prime factors.at n=30A071175
• Numbers k such that Omega(k) = Omega(k+1) + Omega(k+2) + Omega(k+3) + Omega(k+4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=28A078094
• a(n) = 4*a(n-1) + 2*a(n-2) for n>1, a(0)=0, a(1)=1.at n=8A090017
• Number triangle T(n,k) = binomial(n,k)*binomial(2n,n-k).at n=41A110608
• Number of 2 X 2 symmetric matrices over Z(n) having nonzero determinant.at n=31A115077
• Number of benzenoids with 22 hexagons, C_(2h) symmetry and containing 2n carbon atoms.at n=7A123105
• Coefficients in quasimodular form F_2(q) of level 1 and weight 6.at n=21A126858
• Expansion of k/q^(1/2) in powers of q, where k is the elliptic function defined by sqrt(k) = theta_2/theta_3.at n=10A127393
• Denominators of Blandin-Diaz compositional Bernoulli numbers (B^Z^(3))_1,n.at n=4A133001
• Expansion of 1+k in powers of q^(1/2) where q is Jacobi's nome and k is the elliptic modulus.at n=21A134746
• A triangle of polynomial coefficients related to Mittag-Leffler polynomials: p(x,n)=Sum[Binomial[n, k]*Binomial[n - 1, n - k]*2^k*x^k, {k, 0, n}]/(2*x).at n=32A156136
• Number of 13 X 13 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.at n=16A156414
• Number of ways to place n nonattacking nightriders on an n X n toroidal board.at n=13A190393
• Numbers with prime factorization pq^2r^7.at n=10A190466
• Dispersion of (5*n-floor(n*sqrt(5))), by antidiagonals.at n=55A191539