84035

Appears in sequences

• Numbers of the form 5^i*7^j with i, j >= 0.at n=27A003595
• Triangle of coefficients in expansion of (1+7x)^n.at n=32A013614
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j).at n=31A027466
• Numbers whose prime factors are 5 and 7.at n=14A033851
• a(n) = n*7^n.at n=5A036293
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*7^j.at n=16A038273
• Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*7^j.at n=19A038273
• Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n.at n=33A057253
• Numbers n such that n | 7^n + 6^n + 1.at n=20A057298
• Numbers k that divide 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k.at n=49A057490
• Triangular array T(n,k) read by rows, giving number of rooted trees on the vertex set {1..n+1} where k children of the root have a label smaller than the label of the root.at n=31A071207
• a(n) is the number of shapes of balanced trees with constant branching factor 7 and n nodes. The node is balanced if the size, measured in nodes, of each pair of its children differ by at most one node.at n=12A131893
• a(n) = binomial(n+3, 3)*7^n.at n=4A140107
• Positive numbers y such that y^2 is of the form x^2+(x+16807)^2 with integer x.at n=16A156713
• a(n) = 5*7^n.at n=5A193577
• Triangle by rows T(n,k), showing the number of meanders with length (n+1)*3 and containing (k+1)*3 L's and (n-k)*3 R's, where L's and R's denote arcs of equal length and a central angle of 120 degrees which are positively or negatively oriented.at n=32A194595
• Expansion of g.f. (1-2*x)/(1-7*x).at n=6A196661
• Triangle read by rows: T(n,k) = coefficient of [x^(n-k)] in the expansion of the polynomial (x+n)^n.at n=32A243594
• a(n) = n*(n + 7)*(n + 14)*(n + 21)/24.at n=28A264447
• Number of permutations of n elements divided by the number of 6-ary heaps on n+1 elements.at n=40A273734