875826domain: NAppears in sequencesTriangle read by rows, defined by T(n,k) = C(n,k)*S2(n,k), 0 <= k <= n, where C(n,k) are the binomial coefficients and S2(n,k) are the Stirling numbers of the second kind.at n=50A090683Triangular numbers which are sums of 6 consecutive primes.at n=25A173423