68050domain: NAppears in sequencesNumbers k such that 49*2^k+1 is prime.at n=16A032374Numerators of continued fraction convergents to sqrt(105).at n=4A041188Weak Goodstein numbers: a(n) = g_n(n), where g_n(n) is the weak Goodstein function.at n=19A266202a(n) = Stirling2(n,2)^2 + Stirling2(n,3).at n=8A384988