20601
domain: N
Appears in sequences
- Number of partitions satisfying cn(0,5) <= cn(1,5) + cn(2,5) + cn(3,5) and cn(0,5) <= cn(4,5) + cn(2,5) + cn(3,5).at n=37A039845
- Numbers k that divide 5^k + 4^k.at n=37A045590
- Numbers k such that sopfr(k + omega(k)) = sopfr(k), where sopfr(i) = A001414(i) and omega(i) = A001221(i).at n=21A187878
- G.f. satisfies: A(x) = 1 + x/A(-x*A(x)^9)^3.at n=6A213100
- 100-gonal numbers: a(n) = 98*n*(n-1)/2 + n.at n=21A261276
- Numbers such that k is the altitude of a Heronian triangle with sides m-13, m, m+13.at n=16A293846
- Numbers k that divide the k-th central Delannoy number.at n=31A372901