31867

Appears in sequences

• Denominators of convergents to log_2 3.at n=10A005664
• Triangle read by rows: number of commutative monoids of order n with k idempotents.at n=53A058142
• A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the ratios of two tones of musical harmony: the perfect 4th, 4/3 and its complement the perfect 5th, 3/2.at n=26A060528
• a(n) = 4^n mod n^4.at n=18A066608
• 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, 1), (-1, 0, 0), (0, 1, 1), (1, -1, -1), (1, 1, 0)}.at n=8A150426
• Denominators of semiconvergents to log_2(3), which equals log(3)/log(2).at n=42A206788
• Number of length n+3 0..6 arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=16A248535
• a(n) is the least integer k such that there are n values of i <= k for which gpf(i^2 + 1) = gpf(k^2 + 1), where gpf(x) is the greatest prime factor of x.at n=32A258840
• Expansion of Product_{k>=1} (1 + x^(2*k+1))^k.at n=50A263149
• Integers n such that n!/(n-2) + 1 is prime.at n=33A271376
• Number of nX5 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=6A300885
• Number of nX7 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=4A300887
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=59A300888
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=61A300888