19058

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 16.at n=11A031604
• a(n) = floor( exp(n) / Pi ).at n=11A032638
• a(n) = 6*binomial(n,4) + 5*binomial(n,2) - 4*n + 5.at n=17A066455
• Upper bound on number of regular triangulations of cyclic polytope C(n, n-4).at n=34A066456
• a(n) = n*(2*n^2 -3*n +7)/6 = C(n, 1) + C(n, 2) + 2*C(n, 3).at n=38A081489
• Number of nX3 binary arrays with each sum of a(1..i,1..j) no greater than i*j/2 and rows and columns in nondecreasing order.at n=12A183410
• Monotonic ordering of nonnegative differences 3^i-5^j, for 40>= i>=0, j>=0.at n=31A192149
• G.f. satisfies: A(x) = Sum_{n>=0} q^(n*(n+1)/2) where q = x*A(x)^8.at n=5A194043
• Cyclops numbers whose squares are cyclops numbers.at n=37A239827
• a(0) = 16, after which, if a(n-1) = product_{k >= 1} (p_k)^(c_k), then a(n) = (1/2) * (1 + product_{k >= 1} (p_{k+1})^(c_k)), where p_k indicates the k-th prime, A000040(k).at n=41A246344
• Limiting reverse row of the array A274193.at n=38A274200
• Row sums of A291904.at n=52A291905
• Numbers whose second arithmetic derivative (A068346) is a primorial number (A002110) > 1.at n=27A368702