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

1,1

Links

Table of n, a(n) for n=1..83.

Formula

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

Example

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

Crossrefs

Cf. A006577, A066903.

Sequence in context: A342403 A019633 A067277 * A222130 A061903 A309603

Adjacent sequences: A177948 A177949 A177950 * A177952 A177953 A177954

Keyword

nonn

Author

Michel Lagneau, May 15 2010

Extensions

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

Status

approved