66528

Appears in sequences

• Unitary harmonic numbers (those for which the unitary harmonic mean is an integer).at n=22A006086
• Product of terms of continued fraction expansion of (3/2)^n.at n=19A071337
• Numbers n such that A001414(n) = sum of composites from the smallest prime factor of n to the largest prime factor of n.at n=34A074053
• Balanced refactorable numbers.at n=9A078543
• Numbers k such that 2k-1 divides 2^k-1.at n=31A081856
• a(n) = 3*n^3 + n^2 - 4*n.at n=28A083127
• Consider numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 4*(x*y*z)^(1/2)/( x^(1/2) + y^(1/2) + z^(1/2)), x<=y<=z . Sequence gives x .at n=4A144949
• Consider numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 4*(x*y*z)^(1/2)/( x^(1/2) + y^(1/2) + z^(1/2)), x<=y<=z . Sequence gives y.at n=4A144950
• Consider numbers x,y,z such that UnitarySigma(x) = UnitarySigma(y) = UnitarySigma(z) = 4*(x*y*z)^(1/2)/( x^(1/2) + y^(1/2) + z^(1/2)), x<=y<=z . Sequence gives z.at n=4A144951
• a(n) = 2662*n - 22.at n=24A157609
• a(n) = n*(n+1)*(n+2)*(n+3)*(n+4)*(n+5)/5.at n=6A162669
• Numbers n such that sigma(n) = 14*phi(n) (where sigma=A000203, phi=A000010).at n=7A171259
• Where A174102 sets a new record.at n=41A173570
• Triangle T(n, k) = (2*k/(k+1))*binomial(n-1, k)*binomial(n+1, k) with T(n, 0) = T(n, n) = 1, read by rows.at n=59A174117
• Triangle T(n, k) = (2*k/(k+1))*binomial(n-1, k)*binomial(n+1, k) with T(n, 0) = T(n, n) = 1, read by rows.at n=61A174117
• a(n) is the number of convex pentagons in an n-triangular net.at n=17A176646
• Number of 3-turn rook's tours on an n X n board summed over all starting positions.at n=11A187190
• Numbers with prime factorization pqr^3s^5.at n=3A190475
• Principal diagonal of the convolution array A213819.at n=31A213820
• Numbers k such that k divides sigma(3*k).at n=17A227303