19643

Appears in sequences

• Numbers k that divide the (right) concatenation of all numbers <= k written in base 13 (most significant digit on left).at n=41A029458
• Number of n X 3 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order.at n=3A233013
• Number of nX4 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order.at n=2A233014
• T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order.at n=17A233018
• T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally or vertically, top left element zero, and 1 appearing before 2 in row major order.at n=18A233018
• Numbers that begin a run of an odd number of consecutive integers whose cubes sum to a square.at n=12A253679
• Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=34A346135
• a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(floor(n/k)+4,5).at n=16A366723