Significance of Rama Mantra - Sri Rama Rama Rameti.
Goddess Parvathi asks the Lord, which is the easiest way to recite this prayer. God tells that for the learned (pundits) it is enough to repeat the name of Rama. It is also called the Rama Mantra. Rama Mantra - Sri Rama Rama Rameti sloka which when recited gives the same effect as reciting the whole of Vishnu Sahasranama Stotra.
श्री राम राम रामेति रमे रामे मनोरमे ।
सहस्रनाम तत्तुल्यं रामनाम वरानने ॥
Shri Rama Rama Rameti, Rame Rame Manorame;
Sahasrenama tattulyam, Rama Nama Varanane
1: By meditating on "Rama Rama Rama" (the Name of Rama), my Mind gets absorbed in the Divine Consciousness of Rama, which is Transcendental,
2: The Name of Rama is as Great as the Thousand Names of God (Vishnu Sahasranama-stotra, Uttara-khanda, Padma Purana 72.335).