130683
domain: N
Appears in sequences
- Number of Go games with n moves.at n=2A007565
- a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=19A059826
- Sum of squares of divisors of square numbers.at n=18A065827
- Number of alternately orientable perfect graphs on n nodes.at n=8A123405
- Jordan function ratio J_6(n)/J_2(n).at n=18A194532
- a(0)=0, a(1)=1, a(2n)=19*a(n), a(2n+1)=a(2n)+1.at n=21A197353
- Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=24A203173
- Composites whose prime factorization in base 8 is an anagram of the number in base 8.at n=29A260052
- "Primitive" numbers k such that k divides 4^k - 1.at n=36A323203
- a(n) = (n^3+5*n+3)/3 + 2*floor(n/2) + a(n-2), with a(0)=1 and a(1)=3.at n=41A336529
- Numbers k such that sigma(k) = psi(k) + tau(k)^3.at n=36A390297