44226

Appears in sequences

• sigma_3(n): sum of cubes of divisors of n.at n=33A001158
• 4-dimensional pyramidal numbers: a(n) = n^2*(n^2-1)/12.at n=27A002415
• Theta series of 14-dimensional extremal 3-modular lattice with det 3^7, minimal norm 4, group 2 X G_2(3).at n=4A004048
• Area of more than one Pythagorean triangle.at n=33A009127
• Theta series of 14-dimensional lattice of det 3^7 and minimal norm 2.at n=4A018898
• Numbers k such that the set of prime divisors of k is equal to the set of prime divisors of sigma(k).at n=21A027598
• Sum of cubes of unitary divisors of n.at n=33A034677
• Expansion of 1/((1+3*x)*(1-9*x)).at n=5A053535
• Dirichlet inverse of sigma_3 function (A001158).at n=33A053825
• Total number of nodes in all trees with n nodes.at n=13A055543
• a(n) = n^3*Product_{distinct primes p dividing n} (1+1/p^3).at n=33A065959
• Expansion of 1/(1-3x+3x^4).at n=10A090401
• a(0)=1, a(n) = sigma_3(2n).at n=17A091986
• a(n) = sigma_3(3n+1).at n=11A092342
• Coefficients of 12th root of theta series of lattice in A004046.at n=4A107657
• Numbers with no 1's in base 3, 4 & 10 expansions.at n=33A117564
• Sum_{d|F(n)} d^3, where F(n) are the Fibonacci numbers.at n=8A181090
• q-expansion of modular form psi_0^4/t_{3B}.at n=34A198956
• Expansion of (E_4(q) - E_4(q^5)) / 240 in powers of q where E_4 is an Eisenstein series.at n=33A226333
• a(n) = n*(n + 1)*(5*n - 4)/2.at n=26A237616