Most of those packages (e.g. math, random, itertools....) are part of the python standard library, so should be available with any standard installation of python (even if they don't show up in the output of conda list). Conda therefore does not install these separately or have them in its package lists.

Other issues with your attempt are with the names of packages. For instance, you are trying to install scikit-image, but using the shortform name skimage (which is used once it is installed for import, e.g. import skimage). If you use conda install scikit-image, conda will find it.

The standard library should be included with all python installs (which also applies to conda environments when you specify python or a python version). Here you can find what is included in the standard library.

Creating a new environment in conda the following way:

conda create --name <name> python=3.x.y

or

conda create --name <name> python

will install python in your environment.

You can reference this nice cheatsheet for more conda commands.