A251965 Indices of primes in A055729(m), where A055729(m) is the number of primes <= 3^m.

1, 5, 11, 13, 14, 31

Offset

1,2

Comments

A055729 is the sequence primepi(3^n). A087865 are the terms of A055729 that are prime. a(n) is the index of the n-th prime term in A055729.

Links

Table of n, a(n) for n=1..6.

Example

1 is a term since A055729(1) = 2 is prime.
The next prime appearing in A055729 is 53, which occurs at index 5, so a(2)=5.

Mathematica

Select[Range@49, PrimeQ[PrimePi[3^#]]&]

Crossrefs

Cf. A055729, A087865.

Sequence in context: A104215 A287123 A227146 * A093685 A337658 A206548

Adjacent sequences: A251962 A251963 A251964 * A251966 A251967 A251968

Keyword

nonn,more

Author

David Baugh, Mar 21 2015

Status

approved