239778domain: NAppears in sequencesTriangular numbers for which the sum of the digits is a square.at n=32A117404G.f.: A(x) = Sum_{n>=0} x^n*A(x)^(n*2^n/2).at n=8A177401Partial sums of the squarefree integers that are triangular.at n=5A194080Triangular numbers that are palindromes in base 5.at n=12A350991