261376

Appears in sequences

• Composite c such that sigma(c)==2 (mod phi(c)).at n=7A067192
• a(n) = 4*n^4 - 3*n^2.at n=15A079414
• a(n) = Sum_{k=0..n} 2^max(k, n-k).at n=16A107659
• Sum of neighbor maps: number of n X 3 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal and antidiagonal neighbors in a random 0..2 n X 3 array.at n=5A222382
• T(n,k)=Sum of neighbor maps: number of nXk binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their horizontal and antidiagonal neighbors in a random 0..2 nXk array.at n=33A222386
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 313", based on the 5-celled von Neumann neighborhood.at n=17A281041
• Indices of records in A389240.at n=21A386819