28772

Appears in sequences

• Sum of first n terms of A_n (using absolute values of terms).at n=17A039928
• Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.at n=24A048131
• Sum of first n terms of A_n (signed values).at n=17A100543
• Numbers k such that k and k^2 use only the digits 2, 4, 7, 8 and 9.at n=20A137107
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.at n=9A149428
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 5,0,2,1,0,2,2 for x=0,1,2,3,4,5,6.at n=5A197912
• Number of nX5 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.at n=4A230816
• T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.at n=40A230819
• Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=4A237317
• Number of (n+1)X(5+1) 0..2 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=0A237321
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=10A237324
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=14A237324
• Number of partitions of n having an ordering of parts in which no parts of equal parity are adjacent and the first and last terms have the same parity.at n=51A239833
• Number of zeros of the polynomial Sum_{j=0..n-1} z^(2^j-1) outside the unit circle.at n=15A257593