I happened to visit a Islamic website 99 Names of ALLAH(swt) recently, and it had listed all the names of ALLAH (swt), with all the names there is a certain WAZIFA or say certain recitations, that if a certain name is recited 100 times then this benefit will happen.
For example : If a person recites Ar-Rehman 100 times then he will get sharp memory.
Is there any validity to this practice? In particular, can anyone provide me with some authentic ahadith or any reference in Al-Quran regarding it?