27453

Appears in sequences

• Places k where A064608(k) (partial sums of unitary tau) is divisible by k.at n=7A064610
• Numbers k such that the first k digits of log_10(2) after the decimal point are primes.at n=5A081102
• a(n)=a(n-1)+2*a(n-2)-[a(n-1)/2]-[a(n-4)/2]-[a(n-5)/2].at n=22A173534
• Number of zero-sum -n..n arrays of 4 elements with first through third differences also in -n..n.at n=32A202512
• Number of permutations of length 3n with descent set {3, 6, ...} that avoid a certain pattern of length 4 or 5 (see Lewis, 2012, Appendix, for precise definition).at n=3A217824
• Number of (n+2) X (n+2) 0..1 arrays x(i,j) with Sum_{j=1..n+2} j*x(i,j) equal for every row, Sum{i=1..n+2} i*x(i,j) equal for every column, and upper left element zero.at n=6A232647
• Number of (n+2)X(7+2) 0..1 arrays x(i,j) with every row sum{j*x(i,j), j=1..7+2} equal, and every column sum{i*x(i,j), i=1..n+2} equal, with upper left element zero.at n=6A232653
• Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals eight.at n=12A288547
• G.f.: Sum_{k>=0} x^(k^2) * Product_{j=1..k} 1/(1 - x^j)^3.at n=25A376709