134217727

Appears in sequences

• a(n) = 2^n - 1. (Sometimes called Mersenne numbers, although that name is usually reserved for A001348.)at n=27A000225
• Divisors of 2^27 - 1.at n=7A003535
• Number of nonzero coefficients of order n in Baker-Campbell-Hausdorff expansion.at n=29A005489
• Stirling numbers of second kind S2(28,n).at n=1A011577
• Jacobsthal-Lucas numbers.at n=27A014551
• a(n) = 8^n - 1.at n=9A024088
• Number of moves needed to solve an (n+1)-ring baguenaudier if two simultaneous moves of the two end rings are counted as one.at n=27A051049
• Number of points of period n under the dual of the map x->2x on Z[1/6].at n=26A059990
• A multiplicative version of 2^n - 1 (A000225).at n=26A064084
• a(n) = n*8^n - 1.at n=7A064754
• Squarefree part of 2^n-1 : the smallest number such that a(n)*(2^n-1) is a square.at n=26A069112
• Expansion of (1-x)^(-1)/(1+x-2*x^2-2*x^3).at n=52A077896
• Number of irreducible indecomposable permutations of degree n.at n=28A078485
• a(n) = floor of (2^n-1)/n.at n=31A082482
• Number of sets of distinct positive integers whose arithmetic mean is an integer, the largest integer of the set being n.at n=31A082550
• a(n) = 2*4^n - 1.at n=13A083420
• 2^n+(-2)^n-(-1)^n.at n=26A084181
• Partial sums of a Jacobsthal related sequence.at n=27A084184
• a(n) = (n-1)^n - 1.at n=9A085606
• Expansion of (1 + 2*x^2)/((1 + x)*(1 - 2*x)*(1 - 2*x^2)).at n=26A085903