# Confluent hypergeometric function of the second kind Calculator

## Calculates confluent hypergeometric function of the second kind or Tricomi's function U(a,b,z). | |||

Confluent hypergeometric function of the second kind

[1-2] /2 | Disp-Num |

- Purpose of use
- Confirmation of my own implementation.
- Comment/Request
- Are the results of Kummer U correct for larges values of a? For instance, when a=50, b= 0.2, z = 5, the output is -6.E-73. In fact the results are negative for many cases.

[1] 2014/07/19 07:29 Male / 50 years old level / An engineer / Not at All /

- Purpose of use
- Working on a thesis.
- Comment/Request
- How do I compute the U(a,b,z) when a=-2500,b=0.5,large z for example z=10268.
- from Keisan
- Confluent hypergeometric function of the second kind:

U(-2500,0.5,10268)= 5.71332832943457105E+9632

This answer is the same as KummerU(-2500,0.5,10268) in Maple9.5.

[2] 2013/03/15 10:28 Male / 30 years old level / High-school/ University/ Grad student / Very /

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