20423

Appears in sequences

• a(n) = prime(n)*prime(n+1) - prime(n) - prime(n+1).at n=33A037165
• a(n+1)^3 is next smallest nontrivial cube beginning with a(n)^3, initial cube is 8.at n=2A048566
• Numbers k such that 11k = 6j^2 + 6j + 1.at n=35A106388
• Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155347
• a(n) = 121*n^2 - 2*n.at n=12A157040
• Expansion of f(-x^6)^3 / (f(-x^4)^2 * psi(x)) in powers of x where phi(), f() are Ramanujan theta functions.at n=46A262152
• Number of n X 2 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.at n=14A297852
• Numbers of the form Product_{k=i..j} prime(k) - Sum_{k=i..j} prime(k) where i < j.at n=47A387946