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User: David Baugh

David Baugh has authored 2 sequences.

A252504 Number of primes less than n*10^22.

201467286689315906290, 397382840070993192736, 591308502828791273105, 783964159847056303858, 975686344403186930556, 1166671149317708576746, 1357047080144517060882, 1546904858094574427441, 1736311930333612544048, 1925320391606803968923

Offset: 1

David Baugh, Mar 21 2015

nonn

Tomás Oliveira e Silva, Tables of values of pi(x) and of pi2(x), The first 10 values of pi(k*10^22)

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

Original entry on oeis.org

1, 5, 11, 13, 14, 31

Offset: 1

David Baugh, Mar 21 2015

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.

			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.

Cf. A055729, A087865.

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

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User: David Baugh

A252504 Number of primes less than n*10^22.

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

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