Original: 2 , 11 , 17 , 29 , 41 , ... respectively , where ( x ) is the prime-counting function , that is , the number of primes less than or equal to x . The converse of this result is the definition of Ramanujan primes , and the numbers 2 , 11 , 17 , 29 , 41 are first few such primes .
Simplified: 2 , 11 , 17 , 29 , 41 , ... where ( x ) is the prime counting function . The prime counting function is the number of primes less than or equal to x . The numbers 2 , 11 , 17 , 29 , 41 are first few Ramanujan primes .