A151891 a(n) = Pi(A113824(n+1)).
2, 4, 9, 36, 6561, 252252704150178, 1650016588712720468
Offset: 1
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a(6)-a(7) using Kim Walisch's primecount, from Amiram Eldar, Mar 13 2020
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.