67108863

Appears in sequences

• a(n) = 2^n - 1. (Sometimes called Mersenne numbers, although that name is usually reserved for A001348.)at n=26A000225
• Divisors of 2^26 - 1.at n=7A003534
• Stirling numbers of second kind S2(27,n).at n=1A011576
• a(n) = 4^n - 1.at n=13A024036
• Numerator of Sum_{i=1..n} i/2^i.at n=30A036295
• Numbers that are repdigits in base 4.at n=39A048329
• Numbers that are both lucky numbers (A000959) and of form 2^k-1 (A000225).at n=17A057613
• a(n) = 2^n + (-1)^(n+1).at n=26A062510
• a(n) = 2^n - mu(n).at n=25A062777
• Squarefree part of 2^n-1 : the smallest number such that a(n)*(2^n-1) is a square.at n=25A069112
• Expansion of (1-x)^(-1)/(1+x-2*x^2-2*x^3).at n=50A077896
• Number of irreducible indecomposable permutations of degree n.at n=27A078485
• Jacobsthal gap sequence.at n=26A080924
• Resultant of the polynomial x^n-1 and the Chebyshev polynomial of the second kind U_2(x).at n=12A085435
• Eventual period of a single cell in rule 90 cellular automaton in a cyclic universe of width n.at n=52A085587
• Eventual period of a single cell in rule 150 cellular automaton in a cyclic universe of width n.at n=50A085588
• Number of steps needed to reverse a pattern of length 2*n of cellular automaton Rule 90.at n=25A086839
• Smallest k such that k^4 - 1 is divisible by an n-th power, k > 1.at n=27A088041
• Numbers for which rotating one binary place to the right less rotating one binary place to the left is equal to zero.at n=39A088163
• Smallest composite number with exactly n 1's in binary representation.at n=25A089226