Vi and jump to certain line number

Problem message from ssh:

Please contact your system administrator.
Add correct host key in /home/user/.ssh/known_hosts to get rid of this message.
Offending key in /home/user/.ssh/known_hosts:41
RSA host key for server.domain.com has changed and you have requested strict checking.
Host key verification failed.

We need to quickly remove 41 line.

Example to jump for certain line (41th):
 vi +41 /home/rivanov/.ssh/known_hosts
Press key d twice to remove current line.

Source of wisdom: http://www.cyberciti.biz/faq/vi-show-line-numbers/

Just for further information:
Vim keys - http://michael.peopleofhonoronly.com/vim/