81926

Appears in sequences

• Even numbers such that the sum of the odd divisors is a Fibonacci number F and the sum of the even divisors is 2F.at n=14A274062
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 577", based on the 5-celled von Neumann neighborhood.at n=18A283086
• Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A303178
• a(n) is the largest integer that can be written with n digits in base 3/2.at n=24A304025
• The largest positive even integer that can be represented with n digits in base 3/2.at n=24A305497
• Lexicographically earliest sequence of positive integers such that for any m and n with m <= n, a(m) XOR ... XOR a(n) is neither null nor prime (where XOR denotes the bitwise XOR operator).at n=63A333403
• Lexicographically earliest sequence of distinct positive integers such that for any nonempty set of k positive integers, say {m_1, ..., m_k}, a(m_1) XOR ... XOR a(m_k) is neither null nor prime (where XOR denotes the bitwise XOR operator).at n=6A333522
• a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(2*n-k,n-k).at n=5A386919