50864

Appears in sequences

• Numbers whose base-15 representation has exactly 5 runs.at n=13A043672
• Mean divisor of n differs by <= 1 from mean divisor of all numbers from 1 to n-1.at n=27A049010
• Values of n for which pi_{4,3}(p_n) - pi_{4,1}(p_n) = -1, where p_n is the n-th prime and pi_{m,a}(x) is the number of primes <= x which are congruent to a (mod m).at n=28A051024
• Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.at n=5A197176
• Number of n X 6 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.at n=3A197178
• 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 2,2,1,0,0 for x=0,1,2,3,4.at n=39A197180
• 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 2,2,1,0,0 for x=0,1,2,3,4.at n=41A197180
• Sum_{0<j<k<=n} s(k)-s(j), where s(j)=A002620(j) is the j-th quarter-square.at n=31A206806
• Number of (w,x,y,z) with all terms in {1,...,n} and w>2x and y>=3z.at n=34A212519
• Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y>3z.at n=34A212522
• The index of Simon's piecewise testability congruence, for words of length n over a 2-letter alphabet.at n=7A228950
• Take apart the sides of each of the integer-sided triangles with perimeter n (at their vertices) and rearrange them orthogonally in 3-space so that their endpoints coincide at a single point. a(n) is the total surface area of all rectangular prisms enclosed in this way.at n=42A308236
• Triangle of Touchard's chord enumerating polynomial coefficients [x^k] P_n(x).at n=56A322456