27455

Appears in sequences

• a(n) = n*(n^2 + 1)/2.at n=38A006003
• Positive integers i for which A112049(i) == 8.at n=33A112068
• Nonsquarefree "year numbers" (numbers n such that phi(n) = 2*phi(sigma(n)): A137815).at n=3A137816
• Numbers n such that n^4 is a sum of 4th powers of four nonzero integers whose sum is n.at n=4A138760
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, -1), (1, 0, 1), (1, 1, 0), (1, 1, 1)}.at n=7A151217
• Partial sums of A049486.at n=34A174655
• a(n) = 27*(n - 6)^2 + 4*(n - 6)^3 = ((n - 6)^2)*(4*n + 3).at n=23A245032
• Row sums of the triangular array A246696.at n=37A246697
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 587", based on the 5-celled von Neumann neighborhood.at n=30A273079
• a(n) = (n - 1)*(4*n^2 - 8*n + 5).at n=19A317297
• Numbers m such that the product m*(m+1) has a set of prime divisors, from greatest down to 2, that is missing exactly one prime divisor.at n=38A391885