7906276

Appears in sequences

• Numbers that are both triangular and pentagonal.at n=4A014979
• Triangular numbers that are one-third of another triangular number: T(m) such that 3*T(m) = T(k) for some k.at n=7A076139
• Triangle T(n, k, m) = t(n, m)/(t(k, m)*t(n-k, m)), where t(n, k) = Product_{j=1..n} p(j, k+1), p(n, x) = Sum_{j=0..n} (-1)^j*A053122(n, j)*x^j, and m = 5, read by rows.at n=38A156599
• Triangle T(n, k, m) = t(n, m)/(t(k, m)*t(n-k, m)), where t(n, k) = Product_{j=1..n} p(j, k+1), p(n, x) = Sum_{j=0..n} (-1)^j*A053122(n, j)*x^j, and m = 5, read by rows.at n=42A156599