| M | Mabood and Shateyi [19] | Present result |
| 5 | −2.44948974 | −2.6592 |
| 10 | −3.31662479 | −3.4617 |
| 50 | −7.14142843 | −7.2126 |
| 100 | −10.0498756 | −10.1025 |
| 500 | −22.3830293 | −22.4082 |
| 1000 | −31.6385840 | −31.6567 |