68978

Appears in sequences

• First gap of length at least n in A007951, lower end.at n=6A139387
• Number of (n+1) X 5 0..1 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) nondecreasing in column and row directions, respectively.at n=19A204647
• a(1)=2; for n > 1, a(n) is the square root of the smallest square with a(n-1) as a prefix in base 10.at n=17A308055