18585

Appears in sequences

• Odd primitive abundant numbers.at n=25A006038
• Numerators of continued fraction convergents to sqrt(443).at n=2A041842
• Surround numbers of an n X 2 rectangle when n is even.at n=7A061524
• z-value of the solution (x,y,z) to 3/(2n+1) = 1/x + 1/y + 1/z satisfying 0 < x < y < z, odd x, y, z and having the largest z-value. The x and y components are in A075260 and A075261.at n=27A075262
• Odd primitive numbers such that n! divided by product of factorials of all proper divisors of n is not an integer.at n=22A075460
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors. Rearrangements which cause leading zeros are excluded.at n=18A085844
• Odd primitive abundant numbers n such that n = x^2 + x + y^2 with y^2 < 2*x; a subsequence of A006038.at n=3A136476
• Euler transform of powers of 3.at n=7A144067
• Number A(n,k) of multisets of nonempty words with a total of n letters over k-ary alphabet; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=62A144074
• Odd almost practical numbers.at n=34A174535
• Odd abundant numbers whose abundance is even.at n=37A174865
• Numbers n such that (n^6 + 1091)/4 is prime.at n=10A181112
• Irregular triangle of odd primitive abundant numbers (A006038) in which row n has numbers with n distinct prime factors.at n=28A188439
• Number of multilinear monomials corresponding to the association types of A190915.at n=5A190916
• Number of 0..n arrays x(0..8) of 9 elements with zero 5th differences.at n=29A200332
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^3>x^3+y^3.at n=34A211811
• Odd numbers in A192274.at n=29A243104
• Numbers n such that (n, sigma(n), tau(n)) lies on a sphere with integral radius centered at the origin, i.e., n^2 + sigma(n)^2 + tau(n)^2 is a square.at n=4A243455
• Odd numbers k such that the product of factorials of proper divisors of k does not divide k!at n=32A248694
• Partial sums of A080715.at n=34A268403