43393

Appears in sequences

• A diagonal of number array A083075.at n=4A083083
• Numbers k such that 7*10^k - 9 is prime.at n=29A103048
• Triangle T(n,k) read by rows given by [2,1,2,1,2,1,2,1,2,1,2,1,...] DELTA [1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938 .at n=38A133367
• G.f.: (21+104*x+103*x^2+23*x^3+x^4)/(1-x)^5.at n=7A160787
• Number of n X 1 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=16A198655
• Number of n X 5 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=9A207302
• Number of partitions of [n] that contain no isolated singletons.at n=17A211694
• Duplicate of A211694.at n=17A303586