27227

Appears in sequences

• a(0) = 1, a(n) = 25*n^2 + 2 for n > 0.at n=33A010015
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (primes).at n=41A024867
• a(n) = 27225*n^2 + 2*n.at n=0A157820
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 259", based on the 5-celled von Neumann neighborhood.at n=34A271056
• Numbers with digits 2 and 7 only.at n=39A284921
• Number of nX3 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=19A303309