31899

Appears in sequences

• Numbers k such that k + sum of its prime factors = (k+1) + sum of its prime factors.at n=32A020700
• 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 17.at n=18A090891
• a(n) = Fibonacci(n) mod n^3.at n=40A132636
• Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.at n=4A196968
• Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.at n=4A196971
• T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,2,1 for x=0,1,2,3,4.at n=40A196974
• Number of undirected labeled graphs on n nodes with exactly 6 cycle graphs as connected components.at n=4A215766
• Number T(n,k) of undirected labeled graphs on n nodes with exactly k cycle graphs as connected components; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=61A215771
• Number of undirected labeled graphs on n+4 nodes with exactly n cycle graphs as connected components.at n=6A215774
• Number of nX6 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.at n=6A223947
• Number of 7 X n 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.at n=5A223954
• Number of n X 2 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.at n=9A268744
• a(n) is the row of the Trithoff (tribonacci) array that contains the tails of the sequence which is n times the tribonacci numbers.at n=40A351685
• Number of face-connected components of hexagonal prism cells in the hexagonal prismatic honeycomb up to translation, rotation, and reflection of the honeycomb.at n=7A385026
• Number of edges in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer x coordinates |x| = 1, 2, ...n.at n=16A392427