This is also called the mantra of Lord Rama and if devotees chant this mantra with devotion and concentration then it gives the same result as getting by reciting the Vishnu Sahasranama Stotra. Here is the full mantra:
श्री राम राम रामेति रमे रामे मनोरमे ।
सहस्रनाम तत्तुल्यं रामनाम वरानने ॥
श्री राम राम रामेति रमे रामे मनोरमे ।
सहस्रनाम तत्तुल्यं रामनाम वरानने ॥
