4000000000

Appears in sequences

• Powers of 2 written in base 8.at n=29A004647
• a(n) = phi(n^n).at n=9A064447
• Expansion of (1-6*x)/(1-10*x).at n=10A093141
• Erroneous version of A052218.at n=18A094628
• Expansion of (1+4x-6x^2-36x^3)/(1-19x^2+90x^4).at n=19A097112
• Numbers k such that the k-th triangular number contains only digits {0,2,8}.at n=18A119056
• a(n) = numerator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).at n=19A128778
• a(3n)=10^n. a(3n+1)=4*10^n. a(3n+2)=7*10^n.at n=28A135262
• Numbers k such that k and k^2 use only the digits 0, 1, 4 and 6.at n=20A136859
• Number of (n+2)X(2+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column.at n=2A250862
• Number of (n+2)X(3+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column.at n=1A250863
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column.at n=7A250868
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with nondecreasing sum of every three consecutive values in every row and column.at n=8A250868
• The decimal representation of the average of the digits of n starts with the digits of n.at n=22A257829
• Number of even digits necessary to write all positive n-digit integers.at n=8A358439