21639

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 98.at n=30A031596
• Column 1 of triangle A052311.at n=15A052312
• Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of x for n == 1 mod 4.at n=45A053370
• Number of partitions of n plus number of divisors of n.at n=36A195364
• Number of (n+1)X(4+1) 0..1 arrays x(i,j) with row sums sum{j^2*x(i,j), j=1..4+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing.at n=3A232874
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays x(i,j) with row sums sum{j^2*x(i,j), j=1..k+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..n+1} nondecreasing.at n=24A232877
• Dirichlet convolution of the integer partition numbers A000041 with the number of divisors function A000005.at n=37A323766
• Number of non-isomorphic achiral multiset partitions of weight n.at n=37A330223