19666

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 57.at n=35A020396
• a(n) = (27*n^2 + 9*n + 2)/2.at n=38A093485
• Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-6).at n=22A114358
• Semiprime centered triangular numbers.at n=42A184481
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 573", based on the 5-celled von Neumann neighborhood.at n=25A272997
• Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers.at n=6A317046
• a(n) = Sum_{i=1..n, j=1..n, gcd(i,j)=1} i.at n=39A333297
• Numbers that are the sum of seven fourth powers in six or more ways.at n=20A345572
• Numbers that are the sum of seven fourth powers in exactly six ways.at n=16A345828
• Antidiagonal-sums of the array A377038(n,k) = n-th term of k-th differences of squarefree numbers (A005117).at n=18A377039
• Squarefree semiprimes that are centered triangular numbers.at n=39A380913