PSIF (Algorithm 147 [S14]) CACM December, 1969 Parsons, R. G. gamma function, logarithmic derivative, factorial function, psi function 5.12 CA691212 JB February 15, 1978 2:11 PM 1800 4 1800 1800 5 1800 1800 5 1800 1800 5 1800 2222 5 1800 871 5 1800 970 6 1800 1800 6 1800 1818 6 1800 1834 6 1800 2042 6 1800