30894

Appears in sequences

• Cluster series for bond percolation problem on hexagonal lattice.at n=7A003197
• Aliquot sequence starting at 966.at n=14A014363
• (s(n)+s(n+1))/6, where s()=A006521.at n=22A016059
• (s(n)+s(n+1))/18, where s()=A006521.at n=28A016060
• Numbers k such that 205*2^k+1 is prime.at n=16A032479
• Expansion of (1+x)^(1/3)/(1+x-18*x^4)^(1/3).at n=16A098537
• G.f.: Product_{n>=1} (1 + x^n + x^(n+1)).at n=41A160571
• Number of nXnXn triangular 1..3 arrays with all 1s connected, all 2s connected, all 3s connected, 1 at the top vertex, 2 at the lower left, and 3 at the lower right, and no value having more than 3 identical values adjacent.at n=5A164745
• Numbers such that sigma(phi(tau(n)))=tau(phi(sigma(n))).at n=29A226119
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 459", based on the 5-celled von Neumann neighborhood.at n=36A272289
• Lexicographically earliest unbounded aliquot-like sequence based on the Dedekind psi function: a(1) = 318, a(n) = t(a(n-1)) where t(k) = A001615(k) - k.at n=18A323328