A177951 PrimePi(A066903(n)), the index of A066903(n) in the primes.

4, 1, 3, 2, 8, 7, 7, 4, 4, 9, 3, 6, 6, 29, 10, 5, 5, 5, 8, 8, 8, 8, 28, 28, 7, 7, 7, 7, 30, 30, 30, 4, 13, 13, 27, 27, 9, 9, 9, 9, 9, 9, 9, 19, 11, 11, 11, 11, 11, 11, 6, 6, 6, 6, 26, 26, 6, 6, 31, 23, 31, 15, 15, 29, 15, 29, 29, 29, 15, 15, 10, 10, 10, 10, 10, 10, 10, 10, 10, 21, 12, 12, 12

Offset: 1

Author

Michel Lagneau, May 15 2010

Keywords

• nonn

Examples

			a(14)= 29 because prime(29) = 109, and A066903(14) = 109.
		

Crossrefs

Cf. A006577, A066903.

Formula

a(n) = A000720(A066903(n)) = A049084(A066903(n)) . [R. J. Mathar, May 28 2010]

Extensions

Clearer definition from R. J. Mathar, May 28 2010