A151891 a(n) = Pi(A113824(n+1)).

2, 4, 9, 36, 6561, 252252704150178, 1650016588712720468

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Kim Walisch, Fast C++ prime counting function implementation (primecount).

Crossrefs

Cf. A073924, A080355, A080567, A099969, A099970, A099971, A099972, A113824.

Sequence in context: A266929 A242986 A327057 * A309340 A005204 A204428

Adjacent sequences: A151888 A151889 A151890 * A151892 A151893 A151894

Keyword

nonn,more

Author

Artur Jasinski, Apr 04 2008

Extensions

a(6)-a(7) using Kim Walisch's primecount, from Amiram Eldar, Mar 13 2020

Status

approved