30090

Appears in sequences

• Numbers k such that phi(k)+sigma(k) is a perfect cube.at n=20A061366
• Integers k such that omega(k) = omega(k-1) + omega(k-2) + omega(k-3), where omega(n) is the number of distinct prime factors of n.at n=21A076252
• Triangle read by rows: T(n,k) is the number of strongly connected directed multigraphs with loops, with n arcs and k vertices.at n=62A139622
• T(n,k)=Number of (n*k)Xk binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly n ones in every column.at n=40A188449
• T(n,k)=Number of (n*k)Xk binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly n ones in every column.at n=50A188449
• Number of (5*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 5 ones in every column.at n=4A188453
• Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.at n=10A260835
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 470", based on the 5-celled von Neumann neighborhood.at n=42A272421
• Least number k > primorial(n) such that omega(k) = n-1.at n=4A292427
• Sums of three primorials > 1.at n=40A370137
• Products of 5 distinct primes that are sandwiched between twin prime numbers.at n=18A376380
• Ulam numbers sandwiched between twin prime numbers.at n=40A380429
• a(n) = (2*n + 1)*(12 + 11*n + 93*n^2 + 4*n^3)/3.at n=7A387439
• Numbers k such that A392858(k) divides k.at n=45A392613