753664

Appears in sequences

• Numbers k such that d(k)^3 divides k.at n=14A046755
• 16-almost primes (generalization of semiprimes).at n=23A069277
• Number of Pythagorean quintuples mod n; i.e., number of solutions to v^2 + w^2 + x^2 + y^2 = z^2 mod n.at n=31A096020
• Third differences of A129952.at n=17A129955
• a(0)=2, a(1)=7, and a(n) = (3*n+1)*2^(n-1) if n > 1.at n=15A176662
• Number of (n+1) X (n+1) 0..1 arrays with the number of clockwise edge increases in every 2 X 2 subblock differing from each horizontal or vertical neighbor.at n=13A205186
• Numbers that are not the sum of two squares and two fourth powers.at n=27A214891
• Expansion of x*(5+x+x^2)/(1-2*x).at n=18A248646
• Number of maximal cliques in the n-halved cube graph.at n=13A295986
• Number of solutions to x^n == 1 (mod n!).at n=45A318576
• a(n) = 2^n * (1+n*(n+1)/2).at n=13A340257
• Array read by ascending antidiagonals: T(n, k) = P(n, k) where P(n, x) are the scaled Mandelbrot-Larsen polynomials defined in A347928.at n=37A348686
• a(n) is the number of exterior top arches (no covering arch) for semi-meanders in generation n+1 that are generated by semi-meanders with n top arches and floor((n+2)/2) exterior top arches using the exterior arch splitting algorithm.at n=28A365679
• a(n) = product of {p^k : p | n, k = 1..floor(log n/log p)}, a(1) = 1.at n=45A377486