18026

Appears in sequences

• Dirichlet convolution of Fibonacci numbers with sigma(n).at n=21A034747
• Number of maximal sum-free subsets of {1,2,...,n}.at n=35A121269
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=25A202440
• Numbers of the form 5^j + 7^k, for j and k >= 0.at n=39A226818
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 190", based on the 5-celled von Neumann neighborhood.at n=35A270683
• Number of lattice n-gons with ordered sides 1, 2, 3, ..., n.at n=18A273089
• Let s(n,j) be Sum_{i=1..j} (prime(primepi(n) + i) mod n). Numbers n such that there exists j with s(n,j) = n.at n=38A274423
• Row 4 of A328464: a(n) = A276156(16n - 8) / 30.at n=13A328467
• Records in A333549.at n=31A333550
• Consider the figure made up of a row of n adjacent congruent rectangles, with diagonals of all possible rectangles drawn; a(n) = number of interior vertices where exactly two lines cross.at n=19A334701
• a(n) = Sum_{p|n, p prime} p^phi(n/p).at n=34A369687
• Expansion of Sum_{p prime} x^p/(1 - p*x^p).at n=34A373458
• Numbers of the form h^i + k^j where h,i,j,k are distinct positive integers and max{h,i,j,k} - min{h,i,j,k} = 3.at n=33A391670