26071

Appears in sequences

• Sorted k-factorial numbers (numbers of form k-1 excluded).at n=35A028687
• Sorted factorial and k-factorial numbers (numbers of form k-1 excluded).at n=41A028688
• Products p^3 or p^2*q, where {p,q} are consecutive primes.at n=28A033477
• Euler transform of sigma(n), cf. A000203.at n=15A061256
• Numbers k such that (sigma(k)-k) - Sum_{p|k} p^2 = -1.at n=5A070225
• Duplicate of A061256.at n=15A079860
• a(n) = (n-1)^2*(n+1).at n=30A152618
• Sum of first n squares of semiprimes.at n=20A217736
• Maximal non-semiprime number which is a "preprime" of the n-th kind (defined in comment in A247395).at n=27A247834
• a(n) = (p_n)^2 * p_{n+1}, where p_n is the n-th prime, A000040(n).at n=9A251720
• Number of n X 3 nonnegative integer arrays with upper left 0 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.at n=27A252831
• Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=10A258549
• Poincaré series for hyperbolic reflection group with Coxeter diagram shown in Comments.at n=18A265050
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 310", based on the 5-celled von Neumann neighborhood.at n=40A271198
• Number of labeled cyclic chord diagrams with n chords such that every chord has length at least ten.at n=12A324436
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=24A348099
• Greatest positive integer whose weakly increasing prime indices have zero-based weighted sum (A359674) equal to n.at n=31A359757
• Square array A(n,k), read by descending antidiagonals, where A(1, k) = A388984(k), and for n > 1, A(n, k) = A003961(A(n-1), k).at n=54A388981