27508

Appears in sequences

• Number of 5-tuples of different integers from [ 2,n ] with no common factors among triples.at n=26A015649
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, -1, 0), (0, 0, 1), (1, 1, -1)}.at n=10A148451
• Number of arrangements of n+1 nonzero numbers x(i) in -3..3 with the sum of floor(x(i)/x(i+1)) equal to zero.at n=5A189492
• T(n,k)=Number of arrangements of n+1 nonzero numbers x(i) in -k..k with the sum of floor(x(i)/x(i+1)) equal to zero.at n=33A189498
• Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.at n=2A189503
• Number of (n+2) X 6 binary arrays with every 3 X 3 subblock commuting with each horizontal and vertical neighbor 3 X 3 subblock.at n=18A190028
• Number of partitions of n such that (least part) >= (multiplicity of least part).at n=47A240177
• a(1)=1; for n>1, a(n) = least integer greater than a(n-1) such that the sums of the divisors of the pairwise sums of a(1),...,a(n) are all distinct.at n=45A293542
• Expansion of x * (d/dx) Product_{k>=0} 1/(1 - x^(2^k)).at n=46A304909
• Numbers k such that k - A224787(k) is a square.at n=21A386623