40431

Appears in sequences

• Numbers k that divide the (left) concatenation of all numbers <= k written in base 7 (most significant digit on left).at n=12A029476
• a(n) = C(n-2,2)+C(n-5,5)+...+C(n-(3*floor((n-3)/3)+2),3*floor((n-3)/3)+2).at n=25A101551
• Numbers k with property that 19*k + {2,4,8,10} are two pairs of consecutive twin primes.at n=10A152926
• a(n) = 28*n^2 - 1.at n=37A158554
• Meanders of length n and central angle < 360 degrees.at n=20A200062
• Number of nX3 0..4 arrays of sums of 2X2 subblocks of some (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=5A226989
• T(n,k)=Number of nXk 0..4 arrays of sums of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=30A226992
• T(n,k)=Number of nXk 0..4 arrays of sums of 2X2 subblocks of some (n+1)X(k+1) binary array with rows and columns of the latter in lexicographically nondecreasing order.at n=33A226992
• Expansion of (1 + x)^2/(1 - x^3*(1 + x)^3).at n=23A375321