20458

Appears in sequences

• Numerators of continued fraction convergents to sqrt(609).at n=8A042168
• Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0).at n=34A053593
• Open 3-dimensional ball numbers (version 2): a(n) is the number of integer points (i,j,k) contained in an open ball of diameter n, centered at (1/2,0,0).at n=34A053594
• Numbers n with property that n^2 is a sum of some 120 successive primes.at n=9A166262
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].at n=17A211031
• Number of 2 X 2 matrices M with all terms in {1,...,n} and permanent(M) >= n.at n=12A212240
• Decimal representation of the middle column of the "Rule 107" elementary cellular automaton starting with a single ON (black) cell.at n=14A267157
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 435", based on the 5-celled von Neumann neighborhood.at n=29A272151
• a(n) = Sum_{k=1..n} sigma(n*k).at n=23A372710