28371

Appears in sequences

• Molien series for 3-D group X1.at n=26A037240
• Numbers n such that 2*n*k(n) is rational but not an integer, where k(n) is sum of successive remainders when computing the Euclidean algorithm for (1, 1/sqrt(n)) as defined in A086378 (MuPAD program is given there); numbers belonging to A086378 but not to A088900.at n=21A087414
• Numbers n such that (Pi/sqrt(2))^n is closer to its nearest integer than any value of (Pi/sqrt(2))^k for 1 <= k < n.at n=16A095203
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 974", based on the 5-celled von Neumann neighborhood.at n=38A273853
• Numbers n such that there are precisely 15 groups of orders n and n + 1.at n=12A295995
• a(n) = n + 2*binomial(n,2) + 3*binomial(n,3) + 4*binomial(n,4).at n=21A361099