474825

Appears in sequences

• Triangular numbers representable as x*y+x+y such that x and y are triangular numbers, x>=y>1.at n=38A259746
• Triangular numbers n such that psi(n) is also a triangular number, where psi is the Dedekind psi function (A001615).at n=4A292063
• Expansion of g.f. A(x) satisfying 1 = Sum_{n>=0} x^n / (1 - (-x)^(n+1)*A(x)).at n=13A363306